Was developing some loads for my 300 BLK & blew a primer out and this was on a starter load (17.8 gr. of AA1680 under a 155 gr. BTHP). Gun functioned. Noticed blown primer when I pulled brass out of the catcher. Case is carboned up on the back face but otherwise looks OK. I am guessing a loose primer pocket? The rest of the loads shot fine. Not to say I could have not made a mistake on that cartridge, but I fairly careful and weigh all charges.
Comments?
Comments?