Thread: Compressed loads and neck tension.

Hey guys, I need some more experienced people's help here. I've run out of 162amaxs so I was loading some 168 bergers for 280AI. I made some loads of 63.0gr 2225 and its pretty compressed but the problem is before I seat a projectile I can't push a projectile into the case mouth but after the projectile is seated the projectile can be spun inside the case by hand?

Is it just because its a compressed load or is there something I'm missing completely?

What dies? The Redding Comp seaters don't like compressed loads but you've got me on how the pill can spin. Something is fucked up foreshore.

Redding comp dies. I was only sizing half the necks, maybe not enough tension there ill try sizing the whole neck and see if its any better but it just seems strange.

Have you checked the OAL?. I find the compressed loads do not seat consistently with my comp dies. I think the seating stem floats too much? The instructions tells you not to do compressed loads with the comp seater. Might be something in it? Redding are pretty awesome to deal with if you flick them an email. Quick replies when I've asked anything.

Sounds like a classic AI problem. How many firings have the cases done and what cases are you using?
Did you form the cases from new?


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Formed cases from new nosler 280rem brass. I just sized all the necks to the shoulder and they're holding a lot tighter. Cases have been fired 4 times. The 162amaxs held fine with half the neck sized the bergers weren't happy though.
OAL all seem consistent now they're loaded.

Originally Posted by Tahr-Bound

Formed cases from new nosler 280rem brass. I just sized all the necks to the shoulder and they're holding a lot tighter. Cases have been fired 4 times. The 162amaxs held fine with half the neck sized the bergers weren't happy though.
OAL all seem consistent now they're loaded.

Sweet. Good result.
I have to reduce my bushing by .001 every 4-5 firings.
I don't use the expander because I get run out, no matter how careful I am.
Did you need to ream the necks once formed from new? (Doughnut)



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No I haven't turned or reamed any since forming. I didn't even know how that worked till I googled it just now hah! Still a lot to learn.

Some AI cases once formed can have a wee doughnut at the neck shoulder junction. If you can slip a projectile in and out a fired case with no obstruction you are generally fine. If it slips past the mouth but gets held up at the junction it needs to be reamed. It can cause all manner of tension/accuracy issues. Once its done, its done for the life of the case.