rbernie
Contributing Member
I've been setting aside SP 45ACP brass for the day that I need to do a run of 45ACP but am too lazy to switch primer setups on the 550B, and last weekend was that time. All told, so far I've made 600 rounds of SP 45ACP.
Despite the headstamps on this brass being almost entirely ATK brands (Fed, Speer, and CCI), so far I have experienced more primer pocket size variation in the SP 45ACP brass than I've ever seen in any other brass/chambering - ever. My greatest surprise was that probably 5% or better proved too tight to comfortably use without reaming/swaging. There was no visible primer crimp, but the pocket itself was significantly undersized. When I reamed the ones that were too tight to comfortably use, I wound up taking out brass not just around the upper face of the pocket but well down into the pocket itself.
I've never seen anything like this in my 30+ years of reloading. Sheesh!
Despite the headstamps on this brass being almost entirely ATK brands (Fed, Speer, and CCI), so far I have experienced more primer pocket size variation in the SP 45ACP brass than I've ever seen in any other brass/chambering - ever. My greatest surprise was that probably 5% or better proved too tight to comfortably use without reaming/swaging. There was no visible primer crimp, but the pocket itself was significantly undersized. When I reamed the ones that were too tight to comfortably use, I wound up taking out brass not just around the upper face of the pocket but well down into the pocket itself.
I've never seen anything like this in my 30+ years of reloading. Sheesh!