Running ammunition through a pistol question

[The SoCal Gunner]

When you run ammunition through a pistol to test for feeding issues, can working the action somehow push the bullet further back into its casing?

Maybe it is just my Blazer Brass in .45acp because I found 2 rounds from different boxes with the bullet seated further back into the casing. The thing is, I don't know whether it was like that to begin with or after I ran them through the pistol.

I'm guessing it is unsafe to shoot these.

[PLINK]

Yes, it is called bullet set back.

When the bullet is pushed back into the case, it changes the over all length. This usually increases case pressure.

I personally would not fire those rounds just to be safe.

[mothergreen]

repeaded chambering of the same round will cause bullet setback and can be dangerous. do not fire them. I've come across a few that were badly setback new from the factory. its always something to watch out for.

[Stanze]

repeaded chambering of the same round will cause bullet setback and can be dangerous. do not fire them. I've come across a few that were badly setback new from the factory. its always something to watch out for.

http://youtube.com/watch?v=SgeTySoE8IQ

In hindsight, I'm glad my friend's HK USP .40 jammed, he reloads em' hot and if that extremely set-back round chambered and fired. It could of been a different way more exciting kaboom video!

[mothergreen]

damn, lucky it didn't feed.

[Buford]

When you run ammunition through a pistol to test for feeding issues, can working the action somehow push the bullet further back into its casing?


I'm guessing it is unsafe to shoot these.

It happened while being cycled through the action. Yes it can drastically raise chamber pressures.

Here is some Blazer 45 ammo with the same issues. This was caused by being chambered several times.

[The SoCal Gunner]

I've don't recall ever having this problem with any other caliber, but then I have never used Blazer Brass in any other caliber.

[Buford]

I've don't recall ever having this problem with any other caliber, but then I have never used Blazer Brass in any other caliber.

It's not a problem, just something to think about with your self defense ammo. Mine got like that because the kids wanted to handle the 45 so I remove the mag remove the chambered round and put it back in the magazine. And I did this several times before I realized what was happening.

[mothergreen]

thats why when you unchamber a round in your sd gun you unload your whole mag place that round at the bottom and reload it. when the first round (last round) reaches the top its time to shoot it at the range and buy more ammo.

[Buford]

thats why when you unchamber a round in your sd gun you unload your whole mag place that round at the bottom and reload it. when the first round (last round) reaches the top its time to shoot it at the range and buy more ammo.

Learning something new all the time.

[mothergreen]

I learned that little tid bit on glock talk heh. gun boards are a great place for learnin heh.

[4D5auto]

Not enough crimp.

[Buford]

Not enough crimp.

You can only get so much crimp on a round the head spaces on the case mouth.

[COILSPRING]

Winchester Silvertips in .45acp have the same tendency as well...

I've don't recall ever having this problem with any other caliber, but then I have never used Blazer Brass in any other caliber.

I've noticed that Winchester Silvertips have the same tendency to set back after chambering... So much that I no longer shoot them. Weak crimps? I do not know but I don't like the idea. Perhaps it doesn't take repeated chamberings? I really wouldn't want to be witness to a "truly massive display of kenetic energy" (as Bugs Bunny would say...).

[The SoCal Gunner]

Would the bullet being set back cause an increase in pressure greater than +p and +p+ ammunition? I'd really like to know for sure if they would cause any trouble but of course I won't try it for myself.

Maybe I'll email a manufacturer.