lwgreer
lwgreer
20 posts
Joined December 2016

Not sizing correct

Can't figure out what I am doing wrong. Have loaded several thousand 9mm 125 grain polymer coated bullets and all fired OK through 2-3 different guns with absolutely no problems.

Just got a new Springfield 1911 with what is apparently a very tight chamber. 1 or 2 out of 100 will not go into battery or is so tight extractor has a very hard time extracting and sometimes total lock up.

I have tightened crimp and shortened OAL. I was loading slightly long i.e. 1.125 vrs 1.1 with 3.6 grains Titegroup. This helped a lot but still in doing "plink test" I still get bullets that will "stick." Is the resizing station not squeezing bullet case enough? Am I not crimping enough? Am using several different cases; Blazer, Winchester, etc but can't find a trend there. Have measured several bullets and can't find a trend there.

Anyone have a clue or suggestion? Really hate to go through plink test on every bullet.
lwgreer
lwgreer
20 posts
Joined December 2016

RE: Not sizing correct

Update,
I just completed a plunk test of 600 rounds using the actual barrel and had 21 failure to either drop in or fall out. Using the Dillon case gauge all of these 21 work fine. Apparently the case gauge is looser than my barrel.

Looking for thoughts and ideas on how to avoid this.
dillon
Administrator
dillon
3,222 posts
Joined July 2007

RE: Not sizing correct

On the loaded cartridges that failed to fully chamber, what is the case headstamp, and what does the case mouth OD measure?
lwgreer
lwgreer
20 posts
Joined December 2016

RE: Not sizing correct

Head stamps. WIN, Perfecta, WMA,GBC,WCC,FC,LAX,SIG,PPU
Case mouth .38
What about Glock swell concept?
Dillon case gauge .39+
1911 chamber .38
lwgreer
lwgreer
20 posts
Joined December 2016

RE: Not sizing correct

Doesn't appear anyone is following this but thought I would add my 2 cents of my final findings. The Dillon case gauge is definitely generous in size and guns like Springfield have very tight chambers.

On 9mm, the base of the case can get slightly "bulged" when fired from from guns like Glock and other not fully supported chambers. When the case is deprimed and sized, it does not go all the way to the base. Then when firing in a tight chamber gun they get stuck and will not eject...and I mean really stuck!

I found that using the actual barrel to "plunk test" I got 21 out of 600 that would not chamber BUT would seem OK in the Dillon case gauge. When firing the rounds that passed, I got 100% to fire and eject fine.

Can not "de-bulge" the cases like you can with 40 cal because the 9MM case is not straight.

My result is that if reloading 9mm will need to "plunk test" in actual barrel. Don't see any other way around it. Can't think of anything that Dillon could do to fix this other than banning Glocks LOL or tightening up the dimension of the case gauge. I also have become aware of the mark the firing pin from a Glock leaves (rectangle not round) so I no longer even try to reload those cases.

Well enough of the ramble and if anyone has anything to add would love to hear it.
judgecrater
judgecrater
11 posts
Joined July 2012

RE: Not sizing correct

I am guessing your seating depth is still too long. Just got a new Glock with marksman barrel. Had to go from 1.125 to 1.075 on 9mm for a specific bullet.
Insert tight cartridge in barrel and with pliers force a rotation. Remove and see where it is scraping, bullet or brass.
lwgreer
lwgreer
20 posts
Joined December 2016

RE: Not sizing correct

Good thought and that was my first suspicion. Tried that and is scraping the base of the cartridge. Case stays in chamber long after Bullet is gone and will not eject...21 out of 600 but enough to ruin a shooting match.
Thanks for the input
lwgreer
lwgreer
20 posts
Joined December 2016

RE: Not sizing correct

Also reducing seating depth also increases pressure if you are ok with that. With all its popularity 9mm is actually a squirrelly caliber.