What I learned today...

[dogfacepencilneck]

HK usp Tactical .45 will shoot .40 s&w, once... Ok so my roomate borrowed my gun, then he proceeded to grab 12 rounds, load it and shoot it, It fired, but it didnt cycle. He grabbed the ammo from the box of .40 I was shooting. Anyone done this before? Seems to be just fine, but ya never know.

[Brian1979]

Ouch!

There was a thread on here with a cracked barrel and someone who claims to work at HK says they only see damage like that from doing as you mentioned.

I wouldnt doubt there must be some barrel damage but probably only seen from a bore scope. You may have got lucky but if you have a serious failure some time down the road as you get more rounds in the gun you will know what is up.

[SIGtrarian]

HK usp Tactical .45 will shoot .40 s&w, once... Ok so my roomate borrowed my gun, then he proceeded to grab 12 rounds, load it and shoot it, It fired, but it didnt cycle. He grabbed the ammo from the box of .40 I was shooting. Anyone done this before? Seems to be just fine, but ya never know.I fired a .357 SIG in a .40S&W, it's harmless. .40 in a .45 should be equally harmless. Wildcatters fire form cases using a similar procedure. It's harmless.

[Kochaholic]

The damage if any would be seen as gas erosion in the chamber and/or slide face. Did the case stay in one piece? Post a pic of the case if you can. Damage or not, your lucky you still have your eyes, with or without eye protection being worn.

[orfeo]

I fired a .357 SIG in a .40S&W, it's harmless. .40 in a .45 should be equally harmless. Wildcatters fire form cases using a similar procedure. It's harmless.

Not necessarily so. . . the .40 is a much higher pressure round than the .45, plus what Kochaholic said.

[navyman8903]

smack your roomate and check everything under the light, Lots of things look fine.... But if there is no harm then you are very lucky.

[loupav]

I almost did this one. But stopped myself before anything happened. Everyone can make a mistake. I'm glad to hear no one was hurt.

[bnanaphone]

Unfortunately, I have done the same thing with my full size USP 45. I wasn't paying attention when loading my magazines, glock and HK mags look pretty similar, and loaded some .40s in the .45 magazine. I fired the gun and the casing swelled inside the chamber that required a bit of force to get out with a cleaning rod from the other end. Luckily the gun was just fine with a couple of what look like streaks on the inside of the barrel. Not sure if what appeared to be streaks were caused by the .40 bullet or normal wear from shooting. I inspected the barrel and all is well. I was another lucky one.

[MJCOL21]

smack your roomate and check everything under the light, Lots of things look fine.... But if there is no harm then you are very lucky.

+1....this could not be a good thing. I hope the gun is ok and was not damaged.

[RyuNoKai]

wow. One quick punch in the pants, solves everything. Glad there were no injuries, but do recheck everything under the bright light.

[LSP 972]

This occurs far more often than you might imagine. I have three "fire-formed" .40 cases on my desk, that were shot in Sig P220s.

I have witnessed it done a total of five times. Open ammo access of various calibers and inattentive cops impatient to "get it over with" makes for a bad combination.

The .45s weren't damaged in the slightest, BTW.

.

[AWD]

That's about a 12,000 difference in pressure right? Just curious, what do you all do to check the weapon and what do you look for?

AWD

[lerch1966]

I KINDA DID THE SAME THING ON A HUNT IN CANADA ONE YEAR, I FOUND OUT THE "HARD WAY" THAT A 7MM REM MAG ROUND WILL FIT IN A RIFLE CHAMBERED FOR A 270 WEATHERBY MAG... ( ONLY HITCH IS THE BORE IS A LITTLE SMALLER ;).. ) LEMME TELL YOU, THERE WAS NO DOUBT THAT SOMETHING WAS DEFINITELY WRONG WHEN I TOUCHED OFF THE ROUND.. LUCKILY FOR ME IT WAS A FOLLOW-UP SHOT ON A MOOSE THAT I ENDED UP NOT NEEDING.. THANKS TO WEATHERBY USING GOOD STEEL ( RIFLE MADE IN GERMANY ) NOTHING MORE THAN SHORTS FULL 0 POOP AND A BRUISED EGO.. GOT THE MOOSE AND THE TRIP WAS OVER THOUGH..

LESSON LEARNED.. TRIPLE CHECK AMMO !!:eek:

[LSP 972]

Well, I don't think the .40 cartridge is developing its full pressure, since there is a lot of "blow-by" getting around the bullet as it is bumping its way down the bore.

I examined three of these pistols VERY closely after the fact. I found no evidence at all (other than the case, of course) of anything out of the ordinary. Neither the pistols nor magazines showed any duress. In fact, one knucklehead did a beautiful Phase One malf clearance, chambering ANOTHER .40 cartridge, and shot that one too. Before I could get to him, he tapped/racked again, but this one didn't go off. You could see where the firing pin hit the case head, though.

The Sig 220 isn't any "stronger" than any other current service piece with the Browning lock. Personally, I would be more concerned about the attack of rectal/cranial inversion then I would be about the pistol, whatever it may be... :D

.

[orfeo]

. . . Personally, I would be more concerned about the attack of rectal/cranial inversion then I would be about the pistol, whatever it may be... :D

.

LOL

VERY experienced man here. Always has great insight and useful comments.

[rext]

I witnessed my cousin do it in his duty weapon(Sig 220) and it didnt cycle.The primer was hit on the very edge and the case swelled and split.It did not hurt the gun at all and he still fired 45 with no problem.They had loose ammo and he grabbed a handful to shoot.One .40 in the bunch.

[heffa]

I loaded one of my 1911 mags once with 40 (instead of 45) while deep in a conversation. I dropped the slide while walking toward the target and let my arm down with the pistol pointing at the ground and the round fell through the barrel and hit the dirt! I won't do that again that was enough of a warning!