9mm load question


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joustin
July 8, 2014, 05:12 AM
Is anyone out there loading the 125gr SNS casting coated bullets? I am helping a friend out, we started with 3.4 grains of Bullseye at 1.115 OAL. They were jamming and would not pass the plunk test as I did not have the barrel available when I loaded 10 test rounds for him. I had my Lee hand press and a dummy round, I had to drop down to 1.091 to pass the plunk test, anyone have an idea on how that will affect pressure? The gun is a full size EAA witness. Looking for some input and new starting load if applicable.

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typhun
July 8, 2014, 05:45 AM
you sure you have sufficient crimp to remove the case flare and you aren't fully chambering because of that? did you color the bullet with a sharpie and twist it to see if there is a witness mark on the bullet? If so then yes the bullet may be hitting the lands if not you should look to the crimp or perhaps a case bulge. Also does a sized case before flare fit?

918v
July 8, 2014, 10:53 AM
Your pressures are going to be fine. I use a 125gr TC on top of 3.7grs of BE @ 1.040" OAL.

Potatohead
July 8, 2014, 01:19 PM
Yea Ive seen some data that short, I think the Hornady manual is short like that, so im sure its ok but man, I hate squishing a bullet that far down into the case. Gives me the willys.

joustin
July 8, 2014, 04:34 PM
Crimp is light and there isn't any flare that I could measure. I am using a Lyman taper crimp die and it seems to work well. The bullets are coated so I was able to see where they were hitting the lands, the bullets required some force to remove on the two that got stuck, one left the bullet in the chamber and the other was scored enough to show that we were too long. I'll load a few up and see how they work.

Sunray
July 8, 2014, 06:09 PM
1.115" short for a 125 grain cast bullet. Might have something to do with plastic coating. Isn't likely though. Might be a case length thing. Measure a couple. Trim to is .751". That'd be unusual too.
3.4 of Bullseye is .1 under minimum for a 125 cast bullet, according to my Lyman book. Isn't enough to worry about.
If you don't have the barrel what did you 'plunk' into? They resized properly?

Mad Chemist
July 8, 2014, 09:33 PM
Some CZs and Tanfolios are known for having shorter lead from chamber to rifling. Some bullet profiles with a blunter curved ogive can exacerbate the problem.

Your load should be perfectly safe. If you need to increase the charge for function or accuracy do it carefully and in small increments. Since you're at a considerably shorter OAL than what your data provides, stay below your data's max load.

You can measure how much case volume is occupied by your bullet and compare that to the Lyman data. You may just be dealing with an odd shaped bullet.

joustin
July 8, 2014, 09:46 PM
I had the gun and my trusty Lee hand press at the last range trip, I was able to test then. The bullets are a little blunt

Hondo 60
July 11, 2014, 01:30 AM
anyone have an idea on how that will affect pressure?

Going from 1.115 to 1.095 is so small IT'S NEGLIBLE - it won't matter.

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