Author: britrifles
Subject: Inside neck reaming...
Posted: January 23 2024 at 6:12am
I’ve detected it with pin gages in .223 cases resized with a neck bushing FL sizer. Pretty significant, several thousands reduced ID at the neck/shoulder junction compared to the rest of the neck. The inside neck reamer effectively removes it.
Subject: Inside neck reaming...
Posted: January 23 2024 at 6:12am
I’ve detected it with pin gages in .223 cases resized with a neck bushing FL sizer. Pretty significant, several thousands reduced ID at the neck/shoulder junction compared to the rest of the neck. The inside neck reamer effectively removes it.
But, I’ve not detected it in .303 brass that is sized in either the Lee Collet neck die or standard FL die with expander ball. I don’t have a bushing type FL sizer for the .303.
The pin gages come in increments of 0.0005 inches (half a thou). Useful for measuring bullet interference with the neck to achieve a desired neck tension.
Annealing the cases helps reduce springback, so it may be that after 4 or 5 reloads without annealing, the donut will spring back from the expander ball and be detectable. Last year, I started annealing before every reload, and can’t detect it with pin gages in my .303 brass.