400 grit wet/dry sandpaper with some oil on a wooden dowel and a drill?Open the seating die up about two thousandths and the problem should go away.
An OLD RCBSWhat brand seater?
I can try.Can you “slug” the seater die?
Can you “slug” the seater die? Maybe dive a bullet in to a variety of depths and see if Ian and his intuition are right? The case mouth folding in too soo will certainly cause damage like you see.
No. I use my Dillon as intended. Pull brass from tumbler and run through machine start to finish.Did you chamfer the inside of the case mouths?
No. I use my Dillon as intended. Pull brass from tumbler and run through machine start to finish.
I have NEVER chamfered a pistol case in my life.
That philosophy is "intended" for jax bullets. You're loading cast.
Got a tubing mic? What does case wall measure? Wonder if mouth of case is touching bullet before crimping.Case mouth after sizing brass is .373"
After running into flare/powder die it's .388"
After running it into the seat die(no bullet) it's .384"