Thread: Crimping 7mag brass

Crimp cases/projectiles are an "almost" a must on then semi-auto rifles because the recoil and movements of the system (it is only MY knowledge). "Normally" if you loosing neck tension and or accuracy maybe your brass has harden for the times it has been fired (magnums will harden faster than non magnums with 308 case capacities average equivalents) annealing will bring the brass back to good tension if proper annealed, not enough or too much only will create more variance, a consistent neck tension is what will give you consistent accuracy and velocity (keep low extreme speed (ES) and standard deviation (SD)).

My experience with 7 Rem Mag is as i have had 2 at one point and hunt and target shoot with them, still reload and do load development to many different rifles brands and all of them have different "likes".

I hope it is of some help, let "us" know if any more info needed, i will do my best to help where i can.

Mac