November 2015

Handgun Bullets: How Do They Penetrate in Home Materials?

If youíre concerned about how your pistol or revolver cartridge may perform in the close confines of home, then choose a round thatís less likely to travel through a bunch of walls and doors.

All 45 ACP loads made a small hole that became progressively larger with penetration. What we were looking for was limited penetration in.

An important consideration in home defense is the prospect of the penetration of a wall by an errant projectile. The primary objective in a defensive situation is to destroy tissue that is vital to the adversary’s mobility. Only when an object or projectile strikes vital neural pathways (brain, spine, some nerve groups) or major blood pipelines (heart, lungs, some arteries and veins) that cause rapid blood loss will the pressurized system of the human body shut down. The primary responsibility of the home defender is to strike the target. Letting go with a round when you do not have a reasonable expectation of hitting the target isn’t a responsible action. Still, being human, we may miss the target, so it’s wise to know what a projectile (bullet, slug, or shot) may do when it connects with common building materials. Also, besides being responsible for every round we shoot, one of the raters in this test pointed out that the defensive shooter may also like to know what he can expect of materials that might hide or protect him if he or a loved on is under fire from an intruder.

To find out how handgun projectiles reacted to impacts on various materials, we first fabricated wall segments with commonly found wallboard and pine boards, then fired a few hundred rounds of ammunition to destroy the structures. At the end, we came up with common-sense recommendations that can solve the problem of overpenetrating handgun bullets that might be used in home defense. Remember, these tests cannot be compared to the FBI test program. The FBI was looking for penetration. That agency needed loads that would reasonably be expected to penetrate light cover and still strike a heavy blow. We were looking for handgun loads that don’t meet the well-known FBI penetration criteria.

The 38 Glaser Safety Slug lived up to its name. Compared to the full penetration of other rounds, the Glaser penetrated a modest length and produced damage to the wallboard as it gave up its energy. We pried apart the wallboard and found exactly where the Safety Slug stopped, but found no trace of the bullet pieces.

The 9mm DRT is a credible choice, but it penetrated more in wallboard and pine boards than we would have thought, considering it only penetrated 6 inches in water.

Test Media

Wallboard. It should be no surprise that bullets, slugs, and buckshot go through wallboard — it’s just paper and clay. Other generic names are plasterboard and gypsum board. Common product names are Sheetrock and Gyproc. As one of the raters noted, there is no magic bullet that will not penetrate this material in the home and relieve you of the responsibility of aiming straight. We used half-inch-thick wallboard arranged in sections five sheets deep. There was a 1-inch gap between each set of wallboard stacks. Total penetration depth was measured for each round of loads.

When deployed correctly, pistols can be effective inside of a home. Several 45 ACP loads were tested extensively on wallboard and pine boards.

Pine Boards. These were once a universal testing medium, and they only measured penetration. One rater noted that the studs in a wall will be facing rather than length wise. The 4-by-4 posts were spaced 1 inch apart to allow dust and shavings to fall away from the projectile. One of the raters noted that all boards are not the same and that a quarter-sawed board would be denser and tougher. Besides gauging their effectiveness as a barrier in walls, our pine-board penetration results can also stand in for how bullets would do on solid-wood doors, but not lightweight interior hollow-core doors.


The problem of overpenetration of bullets in the home or apartment has been discussed many times. The fear of a bullet carrying far past the area of a gun battle is real. Wounds received by innocent persons who happen to be in the wrong place at the wrong time are not uncommon. However, most of these occur in the open or on the street and are a result of missed shots, rather than overpenetration. Also, the great majority of gunshots are the result of criminals shooting victims and other criminals, rather than honest citizens protecting themselves. So, incidents involving homeowners firing through walls and a bullet exiting the home and causing damage, injury, or death are rare. The same is true for injuries caused inside the home. We believe this is because the vast majority of armed citizens are mature, conscientious individuals. Just the same, tragedies do occur, and we decided more than three years ago that the subject was a fertile field for examination.

We looked at the whole picture and tested ammunition from several angles. We tested common personal defense ammunition that we had given good ratings to in the past and learned how they might fare in penetration testing against home materials. We went far past the usual water testing, since ballistic water testing wasn’t applicable to most of what we were doing. We constructed targets using typical home materials and commonly used homebuilding parameters. At this point, allow us to re-emphasize that carefully placing a bullet in an assailant allows the projectile to expand properly — and there will be no overpenetration problem. Working on marksmanship skills is the soundest advice we can give.

Beyond Marksmanship

Next, knowing the distance between one occupied structure and the next nearest one is helpful, because distance robs errant shots of power and trajectory, because we usually fire at an angled attitude, slightly up or slightly down and seldom perpendicular to the target. Thus, chances are the bullet will come to rest in something before it reaches an occupied home. The bullet may strike the roof, or it may dig into the floor. Or you may have a long hallway with a brick wall at the end to stop or slow a bullet. A studio apartment with thin walls is another matter.

Also, it’s important to realize how ridiculous cinema depictions of gun-battle participants using a chair or mattress for cover really are. Bullets zip right through these constructs. Some furniture may be heavy enough to turn a bullet, and the pine-board results are a good way to estimate those effects without having to shoot up the walnut dining-room table.

As for the difficulty of creating realistic test media, we noted that every test program we read in the popular press was inconsistent, with every author having a different idea of how to gauge the risks of overpenetration. As an example, one of the considerations never mentioned in the popular press is the existence of firewalls between walls in apartment complexes. Building and structural firewalls in North America are usually made of concrete, concrete blocks, or reinforced concrete. These structures are very good at stopping or slowing down bullets.

Pistol Cartridge Notes

Based on our results in this test, we would advise against using round-nose lead or full-metal-jacketed bullets for home defense, if overpenetration is a worry. RNLs and FMJs are effective in the big bores, but the JHPs are is more effective and ricochet is less of a concern. We noticed that RNL bullets sometimes bounced when fired into hard wood. Avoid these bullet designs except for cheap practice.

One point we want to advise you to consider is the choice of bonded bullets. As an example, a wide-mouth hollow point such as the 115-grain JHP used in Buffalo Bore’s +P 9mm load breaks up rather quickly when fired against cinder block and doesn’t penetrate as much in wood as the slightly different Buffalo Bore +P+ load. The +P+ load uses a bonded bullet design, which stays together, as is the intent. Regarding bonded-core bullets then, we need to carefully appraise our choices. For home defense, do we really need a bullet with high penetration against intruders behind wallboard? Generally speaking, what we found was that bullets on the short end in water testing are the least offensive in home penetration. It is clear than the bonded bullets are designed for penetration of sheet metal and window glass and perform as designed. Whether this is desirable is up to the homeowner.

We were also curious about how tougher materials, such as cinder blocks, would defeat bullet passage.These are most often found in a single layer attached to the outside wall of a frame building. Then wall studs, plywood, and insulation form the interior walls. We shot the blocks stacked in groups of four or more. Another consideration is that when the bricks are in sections, mortar holds them together, and the support of the structure keeps them resilient. We also shot some exterior facing bricks, but didn’t record penetration data for either of these because it wasn’t measurable like the wallboard and pine boards were. However, we did collect our visual impressions of what various projectiles did to bricks.

The calibers below 38 Special only made small pock marks in the bricks. Beginning with the 38s, we saw damage. The 9mm and 45 ACP damaged bricks, but hardly enough to go through. After two to four shots, the bricks cracked. A single 357 Magnum took a large chunk out of a brick and often broke it. We found that one to two rounds in the same spot often broke the brick up and crumbled it.

In the case of cinder blocks, the 45 ACP JHPs just made a pock mark and only part of the bullet penetrated on the first shot. The fast-stepping 9mms were much the same. The 357 Magnum 110-grain loads did no more. The Remington 125-grain Golden Saber 357 Magnum struck the block three or four times without great effect, but it did well in previous water testing. The 158-grain Speer JHP 357 Magnum load made a large cavity in the block with the first shot and an opening into the hollow between the two sides of the block with the second shot, and sometimes with the first shot. The third shot with the Speer busted the block. This Magnum is just too much with heavyweight loads. The Winchester 230-grain FMJ 45 ACP also broke the blocks up with very few shots.

Our Team Said

Most of the handgun loads proved capable of penetrating several house walls, as noted in the accompanying table. Since we’ve all been conditioned to think of penetration as the do-all and be-all of bullet performance, it’s hard to think backwards when penetration must be limited.

Among the 22 LR rounds, we don’t recommend any for home self defense. But if your pistol of choice happens to be a 22 and you want to reduce your risk of overpenetration, we’d pick the CCI Stinger 32-grain hollow point.

A better choice for a home-defense cartridge might be either of the 380 ACPs, the Hornady 90-gr. FTX and Fiocchi 95-gr. FMJ.

There are good selections from the 38 Specials. The Glaser Safety Slug in 80-grain weight offered plenty of velocity but not as much penetration. The Winchester 158-grain lead roundnose is a similar performer in a more traditional form.

The DRT 85-grain would likely be our first pick from the 9mm Lugers, but the Buffalo Bore 115-grain JHP and Fiocchi 124-grain Extrema JHP would be good choices as well.

If you shoot the big 357 Magnum wheelgun, your lowest-penetration choice would be the Cor-Bon 100-grain Pow’RBall.

Among the 45 ACPs, the Glaser Safety Slugs stand out.

Written and photographed by R.K. Campbell, using evaluations from Gun Tests team testers.

Comments (9)

How about a Glasser Safety Slug test and maybe frangible bullets?
These are designed to be devastating in the body but are notorious for minimal penetration.

Posted by: GrandpaHalfdime | October 19, 2018 1:20 PM    Report this comment

What about ratshot for home defense ie 357 mag?

Posted by: iggieman | October 19, 2018 12:51 PM    Report this comment

I appreciate all the work that went into this test! In my opinion the testing materials represent what you would encounter in a tactical situation.

Posted by: rcwest1971 | October 19, 2018 10:03 AM    Report this comment

Please explain the results for the following:
22 Magnum CCI WBP: 12" PBP: 6" Rating: C
22 Magnum Hornady WBP: 12" PBP: 5" Rating: C
45ACP Win WBP: 12" PBP: 7" Rating: B
9mm Federal (147gr) WBP: 12" PBP: 9" Rating: B
357 Mag Win WBP: 11" PBP: 7" Rating: B
9mm Fiocchi (124gr) WBP: 10" PBP: 9" Rating: A
9mm Buffalo (115 gr +p) WBP: 10" PBP: 8" Rating: A
9mm Dynamic Research WBP: 10" PBP: 8" Rating: A
38 Spl Win +P WBP: 10" PBP: 9" Rating: B

The basis for distinguishing these ratings is not explained, in my opinion. Is there a bias in favor of larger bore cartridges that really don't perform all that much better than small bore?

Posted by: Mr_Ree | November 21, 2015 7:03 PM    Report this comment

Great article Guntest! There are a lot of us out there that appreciate your time and dedication to the CCW world and home defense. There is a ever growing population of folks that are purchasing and owning guns and these test you perform are essential in understanding all the parameters that need to be taken. I do hate to see all the political nonsense by some posters. Extremely narrow minded.
Also, in the future, I would like to see your take/test on the new Poly ARX self defense ammo.

Posted by: davevabch | November 21, 2015 4:26 AM    Report this comment

Just how big is this house you're defending? Nothing you are shooting at should be over ten feet from the shooter. If worried about bouncing buckshot, use a barrier to protect the shooter.

A firewall is mentioned in the article. What is described is a fire barrier, NOT the same thing.
A fire barrier is usually enough sheetrock based on the sheetrock's fire rating. Typically much fewer sheets of sheetrock than you are currently shooting. Plus a fire barrier is usually only between different apartments.

Offices will not even have fire barriers as their walls are often constructed of metal struts with cloth walls.

Unless someone is defending a big box hardware store, they're rarely going to see that much sheet rock.
And no, stacked sheet rock is not the same as 2", 4", 6" spaces with sheet rock on both sides and lots of odd obstructions inside, e.g. wire, nails, electric boxes and outlets, plumbing, etc.

Bullets usually have their direction of travel changed after even small impacts. Any hunter that shot a stalk of grass and missed a deer fully understands that.

There is no equivalence between shooting six inches of wall board and shooting through three walls ten feet apart.

Many residential houses lack substantiality. Even many of their exterior walls lack plywood. I grew up in a Levittown house where the exterior walls were sheetrock covered fiber insulation with a hard asbestos shingles for the outside. Criminals knew they could just cut out the wall after ripping off a few shingles if the door was a problem. Bullets fired in Levittown can pass through the entire house if they miss hard obstacles.

FMJ and RNB are just as capable of ricochet or bouncing as any buckshot.

I do not know why people suggest birdshot for defense. They might as well use rock salt which was still used when I was young. I knew a kid at school that had a bunch of red marks on his butt and the backs of his legs. We got to watch them slowly disappear every gym period.

Shot size 6 is the first to pack some penetration, but not very deep, think deep under the skin level. Blinding someone could have legal repercussions.
Shot size 5 gets to start penetrating better with 4 and 2 both upping the ante. Shot size 5 will not pass through the body of birds like pheasants and ducks yet within ten feet shot size 5 will grind a patch of flesh thoroughly

Keep testing!

Posted by: ATheoK | October 30, 2015 9:38 PM    Report this comment

Shooting at the range is NOTHING like a potential home shooting. You are not shooting paper, and your target may know the house is occupied, and come armed. The house will probably be darker than a range, and the adrenaline run will cause you to lose some of your fine motor control: you may very well miss.

Posted by: Marty g | October 29, 2015 1:22 PM    Report this comment

Any word on (old) plaster over steel lath (or wood lath)? Older home (1920) with most of the original plaster.

20 gauge 2 3/4" Dove & Quail was always said to be the best home defense load that wouldn't over penetrate from one space through to an adjacent room.

Posted by: AR | October 16, 2015 10:49 PM    Report this comment

These tests assume that the home defender does not practice at all with their firearm - A dangerous situation at best, liable to kill the family and save the intruder. I would have been much more impressed with this "study" __IF__ these testers would have shot the .357Mag, .45ACP, etc. rounds through a side of pork covered with several layers of denim before shooting the house materials - The damage to structure building materials would be substantially less than the OMG! results published in "Handgun Bullets: How Do They Penetrate in Home Materials?".

Most "sane" people DO NOT want an unskilled backhoe operator or carpenter working around their home - That doesn't preclude John Q. Public from hiring the same. Why such gross naivety when it comes to responsible firearm ownership on the "possibility" of one missed round?

Remember that the defenders of the home __are always__ the VICTIMS, and their only concern is to PROTECT their loved ones and ELIMINATE THE THREAT - Concern over what happens if one round misses will get a family killed. No home defender, except maybe Joe Biden and his ilk, would let rounds fly haphazardly across and around their home and off their back porches.

This Gun Test article has all the hallmarks of progressive/socialist activists: That is 1) create a crisis (where none exists), 2) offer a "compromise" (which was not needed), thereby 3) creating a foothold within, which modifies peoples' behavior more to their liking. An example of this behavior in action is the anti-gun establishment's "common sense gun laws". The behavior is pure Saul Alinsky activism for creating footholds that erode common sense morality and liberty as taught by our country's founders. Unfortunately, too many citizens today are just along for the ride and easily swayed, as long as their comfort level isn't upset.

In re-reading this article, it appears it's a plant by a left activist employee embedded within the Gun Test family. After all, Saul Alinsky tactics have blossomed like Europe's 14th century black death - Beginning in the 60s (with Marxists teaching core courses within our universities), nearly consuming a free America within five-plus decades.

The results are spectacular: Nearly our entire public school system has no moral compass (teaching kindergartners how to put a condom on a banana, banning prayer and Christmas, etc); entire churches (e.g. Sojourners), and portions of large church congregations either promote or have fallen victim to socialist teachings (e.g. The USCCB past support of ACORN and Saul Alinsky tactics, ND conferring a PHd on president Barrack Hussein Obama, etc). Why not use the same tactics on Gun Test readers?

Posted by: Mick R | October 16, 2015 3:31 PM    Report this comment

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