In this time of shortages I am running out of BR2 primers. I was able to snatch up a brick of CCI 250's how far off are the two? I realize I will need to work a load back up, how far will I need to back off current pet loads? how different are the two? I also have some CCI 34, WLRM, and Fed 215's. Would one of these be more suitable replacements?