Since starting to reload 9mm I’ve been having some issues with ammo getting loaded that sticks in the chamber of a couple of my guns. I originally thought that this had to do with the somewhat “fat” ogive of the bullets I’m using so I began to load them a bit shorter, and shorter trying to back them off of the rifling a bit so that they wouldn’t stick in the chamber anymore.
I originally started loading 9mm at 1.14″ OAL, and then started shortening them down, all the way to 1.10″ but I was still getting rounds that would stick in the chamber.
I picked Ben’s brain about this over the weekend while he was over working on some other things, and we noticed that somehow I’m getting some brass that’s coming out of the sizing die a little short (.740″ instead of .745″-.748″) but that doesn’t seem to be the problem.
At this point I have about 400 rounds loaded at 1.120″ and I painstakingly chamber checked all of them in the new Glock 34. I ended up with about 5% of the rounds that would stick in the chamber for no apparent reason. The rounds slide 90% of the way in, then they meet some resistance, and get stuck. Other rounds with the same length brass, same exact overall length (even some that I loaded quite a bit longer) drop in and pass a plunk test without issue.
I suspected that I may have gotten a batch of bullets that hadn’t been sized, but quickly ruled that out by measuring 100 of them at the base and they were all a perfect .356″ in diameter.
Being that the rounds drop into the chamber most of the way before meeting any resistance I began looking at the bullets themselves (125gr Blue Bullets) and it appears that for some reason or another some of them are catching the rifling at the front of the chamber, even when others loaded exactly the same length, and some others loaded a good bit longer don’t stick.
I’ve pulled the bullets from the rounds that stick and the ones that don’t and they look identical, and measure up perfectly so I’m not inclined to blame the bullets. What I did do though was take one round that was sticking and very carefully scrape the coating off of the lead around the case rim.
It passed a chamber check after doing this. For some reason that I have yet to figure out, some of these bullets catch and stick, and others don’t.
I found that if I load them all down to 1.10″ OAL they all pass a chamber check, and they seem to shoot fine without any pressure signs, so I’ll probably blast through the rest of these loaded short and try another projectile in the future.
Has anybody had a similar issue with coated lead projectiles? I’m still pretty new to reloading, and I can’t seem to find a difference between the bullets that stick and the ones that don’t, so I suspect it’s more likely something that I’m doing, and not the bullets themselves.