.22 WMRcase pistol?

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Permalink Reply by Robert Hylton on July 9, 2011 at 7:40am

here is a good link to a article posted on cheaper than dirt. hope I am not breaking an rules posting weblinks like this...

 

 

http://cheaperthandirt.com/blog/?p=842

 

 

explains a bit about the rarity of 22 magnum autopistols

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Permalink Reply by Michael D. Teal on July 9, 2011 at 10:12am

How about 17 HMR? I think the 17 HMR would be better because it would be alot more fun to shoot. I think I read somewhere that 17 HMR has more stopping power than 22 magnum even though it has a smaller bullet.

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Permalink Reply by Oleg Volk on July 9, 2011 at 11:43am

On a small varmint, higher velocity 17 would work well, on a human or a dog it would lack penetration.

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Permalink Reply by Michael D. Teal on July 9, 2011 at 12:25pm

Oleg, so are you saying that 22 magnum would have penetration on a dog or human? Where as the 17 HMR would not have penetration.

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Permalink Reply by Arne Boberg on July 9, 2011 at 2:12pm

ROFLOL!!!  Seventeen HMR was the first cartridge I experimented with when I started this venture in 2003.  There was a front page image on a 2002 issue of Rifleman with the caption: "The Little Cartridge that Could".  I loved the idea of a bullet that small with a bottlenecked case, but knew that the slow-burning powder would need a boost somehow in a pistol length barrel; so I experimented with "squeeze guns" - rifled barrels that tapered to .001", .002" and .004" at the end.  The experiments were a failure since the more squeeze, the slower the bullet went (I lost an average of 15 feet per second with the .004" squeeze).  That being said, a 3-1/2" barrel would make a .17 HMR penetrate over halfway through 1/2" lexan (polycarbonate).  .32 and .380 would just put dents in it.  9mm generally passes right through this material.

 

I believe there will be a photograph of the .17 HMR/Lexan test sample in the upcoming Boberg Arms Story coffee table book.  Warning - do not try shooting polycarbonate - bullets can ricochete straight back!

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Permalink Reply by Oleg Volk on July 9, 2011 at 2:17pm

17HMR and FN 5.7x28 are usually loaded with frangible bullets, shallow wounds result. 22WMR from pistol pretty much never expands (except with the more recent Gold Dot and Critical Defense loads), so it penetrates more adequately.

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Permalink Reply by Robert Hylton on July 9, 2011 at 3:45pm

people have had success with the .17 HMR on game up to coyote size, but thats really pushing it. the factory varmint  Vmax bullets will practically expode in a soda can of water, dumping all the energy of the bullet in the can nearly turning it into aluminum foil. you can get solids designed to preserve small game, but I have not tried any penetration tests with those.

 

I recall reading about the Germans using Squeeze bore anti-tank cannons early in WW2, they used a Tungsten penetrator to reach 1400 mps, it started at 28mm and was 20mm upon exiting the bore. the short supply of tungsten caused it to be dropped from service.

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Permalink Reply by Oleg Volk on July 9, 2011 at 4:03pm

17HMR from pistol isn't too different from 5.45PSM -- lousy stopper.

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Permalink Reply by Michael D. Teal on July 9, 2011 at 4:34pm

Okay now I get it. So the question is which round would have more stopping power from a pistol with a 3.5in barrel?

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Permalink Reply by Oleg Volk on July 9, 2011 at 4:41pm

22mag would be ahead, then 5.7, then 17HMR...but each would have serious muzzle flash. 32ACP would perform almost as well and be easier to shoot. 7.62x25 would perform much better at the cost of more flash.

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Permalink Reply by Robert K. Stoddard on July 9, 2011 at 6:33pm

I can remember being somewhat fascinated by the descriptions of those German "squeeze-bore" antitank weapons, too.  But I am quite sure that if you could test one of them with and without the "squeeze" in the bore, you would get results like Arne did-- a loss in muzzle velocity due to the restriction.  It seems inevitable.

Robert Hylton said:

people have had success with the .17 HMR on game up to coyote size, but thats really pushing it. the factory varmint  Vmax bullets will practically expode in a soda can of water, dumping all the energy of the bullet in the can nearly turning it into aluminum foil. you can get solids designed to preserve small game, but I have not tried any penetration tests with those.

 

I recall reading about the Germans using Squeeze bore anti-tank cannons early in WW2, they used a Tungsten penetrator to reach 1400 mps, it started at 28mm and was 20mm upon exiting the bore. the short supply of tungsten caused it to be dropped from service.

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Permalink Reply by Aron on July 9, 2011 at 8:52pm

I have a .17HMR revolver with a 1-5/8" barrel on it.... 75% of the time they just tumble.....But it is a fun little gun, LOUD too! I also have a .22magnum AMT AutoMagII compact , the working portion of the barrel (where the bullet actually travels) is about 2-1/4".. I find poly tipped bullets down range that look like I could reload them...LOL...But they both could double as a flashlight!

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