03-24-2011, 12:20 AM
I've seen something like this happen with 7/08 RP brass with a collet die when I had it set too low. In my case the bulge was outwards where the shoulder met the main case wall. I had to full length resize the once fired to get it right. And in some cases, pull the bullets and resize as they would not chamber.
By the way, I'd have expected the expander ball to correct your problem on the upstroke. It also appears that the overall case length is shorter by the buckle amount... is that just the photo or is there a difference?
Lastly, do you really want to lap the neck section of the die??? Unless you are concerned it's overworking the brass I'd focus on the expander ball. Even at it's current smaller dimension the ball should expand it to it's size (expander ball OD + wall thickness minus spring back). The Hornady dies have a setup point for where they want the ball to be. If you do not do that you can run into problems. From memory it's where the air vent bleed hole is.
By the way, I'd have expected the expander ball to correct your problem on the upstroke. It also appears that the overall case length is shorter by the buckle amount... is that just the photo or is there a difference?
Lastly, do you really want to lap the neck section of the die??? Unless you are concerned it's overworking the brass I'd focus on the expander ball. Even at it's current smaller dimension the ball should expand it to it's size (expander ball OD + wall thickness minus spring back). The Hornady dies have a setup point for where they want the ball to be. If you do not do that you can run into problems. From memory it's where the air vent bleed hole is.