I have just been loading some .243 win with 90gr Lapua Scenar bullets.
I was using two types of brass both factory loaded originally and on their first reload.
The two types were Remington and federal.
They were both sized and primed ok.
When I fitted the bullets the Remington all came out OK.
Not all but most of the Federal looked like they collapsed.
The shoulders had been kinked.
Is this common could it be faulty cases or faulty set up in some way?
I tried some more of each and the same happened again rem OK Fed squished!
I'm assuming they were fired in the same gun.
Was the brass trimmed to the correct length? Sometimes the neck length can be different and the crimp may actually conact the case on one make and not the other. I always make sure I adjust the seating die for each brand of brass. May not be necessary but I'm paranoid when things are not the same.
If you're gonna be dumb you better be tough.