Why not cut the parent cartridge to length, anneal as required and expand the case with the appropriate diameter mandrel? Little or no fire forming required.

Scratch the trimming idea. The parent case is just shy of 3”. I still think the neck can be expanded to sufficiently…..I may try that in a few days.

Last edited by Ken Nelson; 12/07/23 07:35 PM. Reason: Trim length corrected.

Dodging lions and wasting time.....