split case

Hey all, i've been handloading a few years (38/357, 45-70, 45 colt/ 454 casull, 30-30, 338 lapua ). Ive mainly focused my attention in the 45-70, 357 mag and 454 casull loading the other calibers rarely. Being straight walled cases i haven't annealed anything. Ive had the occasional split case...

I had something happen yesterday at the range that I thought needed to be shared. I had a quantity of 9 mm reloads; 4.9 grains of Power Pistol behind a 124 grain Acme coated "lipstick" RN bullet. I've used literally thousands of this load with no issues whatsoever. The reload brass are various...