Tuesday, October 11, 2016

Dud rounds

Tam finds duds.  she shoots more than me, but she does seem to get more duds.  Proportionately

I can count on one hand the number of dud I've had.  But sadly, I've never documented it.  Ima be much more meticulous on that in the future with the centerfire guns I've 'made'. 

That said, I'd did have a dud .22 only last Saturday.  I treated it wrong.  I was too quick to clear instead of waiting out a hangfire.  Quick malfunction drill to super safety?  People go both ways.

Hey Tam!  Do you ever come across a round in your 2000 round endurance challenges where you go, "Damn, that one is all Broke-Richard, I can tell by looking at it."  And then are tempted to not even try it?  Like the bullet is set too deep and swelling the case, or the primer is in sideways?  I assume you don't try to run an obvious problematic round.  You are testing a gun with a variety of ammos for reliability, not the ammo for reliability, so my guess is you toss one like that in the rare case you find one. 



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2 comments:

Tam said...

I was getting one sideways primer per 500-rd case of Remington .357SIG.

Didn't notice them when loading.

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October 11, 2016 at 11:33 AM
Will said...

BTW, if you run into the situation that you have vertical stringing, and aren't in a rush to shoot, you might consider that you may be encountering bullet setback. Measure OAL, and then remove a chambered round that has been loaded by firing the prior round. You can do it by dropping the slide lock, but the dynamics won't be identical, but should be close.

I've encountered this in both remanufactured and factory new ammo. The new stuff was .45acp in Blazer Brass, and I suspect the cases had no temper. Of course, the case that we took to gun school was bad, but tests of some of the rest of the shipment seemed ok. All the same batch. According to my buddy, Blazer didn't seem to care. His Govt Model choked on trying to feed the stuff, as it would stop on the ramp, having soaked up the recoil spring energy. My Officers Model, with it's 24lb spring and port and polish, fed just fine, but accuracy sucked, turning those occ/cran shots into face hits, mostly.

In reman .40s&w, I was seeing near 0.070" setback in a G27 Glock. BTW, that pistol would set back even good factory stuff. Might just be .001", but if you re-chamber the same round like you would tend to do if unloading at the end of a duty shift, guess what the potential end result could be? With the Glock, if I re-chamber, I do it by locking the slide back without a mag, dropping it into the chamber by hand, lowering the slide down to the round, and then smacking the rear of the slide to pop the extractor over the rim.
The Glock pistols seem to be hard on ammo this way. I talked to Glock USA about it after I ran my test, and they mentioned that the factory was aware of the situation.

Other brands may be the same/better/worse, but I haven't seen anyone do any comparative testing of potential bullet setback on available guns.

October 14, 2016 at 12:32 AM

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