Scary .40S&W round

[Irving]

Oh, you're talking about how on an M&P, the slide will release when you punch the magazine in. I'm following you now.

[cofi]

Uh...it's not a hard insert, it's a finesse insert which disengages the slide lock. Hard to explain and I don't know the physics behind it. If you insert it hard, you knock the rounds out of alignment in the magazine and even cause the round to feed incorrectly. I've seen people trying to do it and they ram it hard, only to screw up the rounds and/or have FTF's.

You don't need to slam it in. You kind of roll the magazine into the well while keeping a lot of palm contact with the base of the magazine. The rear of your palm will gently "bump" the magazine as it seats and the slide will come forward. Now, not every gun will do it, so don't force it. If after two or three tries, then stop trying, as you're either doing it completely wrong or your gun won't do it without a lot of force.






I know, right!? I told him to do it with those at home and to practice with them

all of the glocks i have shot do that for some reason

[rondog]

I just take rounds like that, put 'em in my inertia bullet puller (hammer-type) and knock 'em a little until the bullet is out just a little too far. Then I'll run 'em through the press to reseat them to the proper depth/OAL, and crimp them. Voila, problem fixed.

And FWIW - I NEVER cycle the same round in and out. In fact, I rarely unload my carry piece anyway, no reason to. If I have to, the round that was chambered goes to the bottom of the mag and a fresh one goes in. I check them for OAL/setback as well, so I can find rounds like this just in case it happened. Setback can happen with only ONE chambering.

[CroiDhubh]

Oh, you're talking about how on an M&P, the slide will release when you punch the magazine in. I'm following you now.

Also my HK, the Glocks I used in the police academy, the Sig Sauers Lemoore PD used to use (don't know if they still do), the Ruger SR40 the fellow employee uses, my fiancee's M&P Shield 9 and my brother's Ruger P91DC (though that last one doesn't do it consistently). Not every gun will do it every time, just some seem to do it more readily than others. Sometimes it's from wear, though, and if your gun does it and you don't believe it should, it's time to get it serviced.

Should never teach oneself to rely on it. Even my M&P40c doesn't do it 100% of the time.

[DSB OUTDOORS]

Meh, pull, resize, reload, and for god sake a "Taper crimp" is your friend if done right for semi autos. IMHO.

[BuffCyclist]

Food for thought:
https://plus.google.com/+luckygunner/posts/CiVxdHvWjYS

Interesting read, though it still would make me hesitant to shoot a round that looks like that through my own gun while holding the pistol.

Tossing 1 round that looks like that is no more than $0.50 (perhaps up to $1 in these modern times) and would make me more comfortable than risking the kb. And that's not just in my Glock 23, I would do that in any firearm.

[SA Friday]

^^^ Either this, or just shoot it. No reason to have a tizzie fit over it. It's no big deal. Any pressure increase in the case will be negligible.

That is the worst advise I've read in years.

DO NOT SHOOT THAT ROUND!

Bullet set-back will blow up a gun just as fast as a double charge of powder, especially in 40 S&W as it's loaded to a higher SAAMI chamber pressure than 9mm and 45 ACP.

The bullet gets pushed back into the case from impact with the feed ramp. Chamber a round enough times and I don't care how it was loaded, the bullet will set back into the case. Want to test it? Well, I wrote about it with pics and testing and posted it here years ago...

http://www.ar-15.co/threads/16723-Bu...ghlight=kaboom

[Akyla]

That is the worst advise I've read in years.

DO NOT SHOOT THAT ROUND!

Bullet set-back will blow up a gun just as fast as a double charge of powder, especially in 40 S&W as it's loaded to a higher SAAMI chamber pressure than 9mm and 45 ACP.

The bullet gets pushed back into the case from impact with the feed ramp. Chamber a round enough times and I don't care how it was loaded, the bullet will set back into the case. Want to test it? Well, I wrote about it with pics and testing and posted it here years ago...

http://www.ar-15.co/threads/16723-Bu...ghlight=kaboom

Just read the post that you linked to. I'll be checking my carry rounds more carefully for setback. Thanks!