I am loading 357 mag. Have loaded hundreds of shells previously, with no problems. I opened a new bag of remington brass, went thru the whole process like always, but when i started to put the bullets in first 5 or so no problem then they started to buckle kept trying some would buckle bad some slightly and some not at all. My question is~~ could the brass be defective? Has anyone ever had brass that was defective? I checked everything (bullet, case) with a mic. and every thing measures right. If my photo came thru you can see the buckel,I noticed on the one on the right there is a line around it which you can feel.
I have another bag of new brass but they were both bought at the same time, so i'm a little shy at trying them.
any thoughts ? I even reset all my dies, thinking maybe that was the problem. I'm really leaning toward the brass being defective.
Thanks for any help.
I use a flat washer on the shell holder when setting my seating die, unless I'm crimping. As far as the shiny ring on the brass, it looks like an old crimp, but it's new brass. Who knows what happened.
As PAjoe mentined about belling the cases first before seating.
I never seated as I was crimping, but it sounds like it can be done.
You can crimp as a separate operation if you wish. What brand of dies do you have? I would also de-grease and lightly graphite the seating die. Have you been flaring your cases before putting in the bullet?