Author: Sapper740
Subject: Effect of Primer Selection on Muzzle Velocity
Posted: January 13 2025 at 5:58am
That's an interesting result Brit, there's always so many variables when handloading for accuracy. I wonder what you would find if you tested primers from different case lots? I had an excellent recipe worked up for my LB using fireformed Dominion brass with Hornady 150 gr. SST bullets over Varget and CCI LRP. From a rest it would shoot 1 MOA. I eventually used up the 1000 primers in the LB and several other .303s I was reloading for and started with a newer case lot, same primer. I was never able to achieve the same accuracy again. Funnily enough, I have a chrono but seldom check each load's velocity, something that's going to change now that I'm retired and have more time.
Subject: Effect of Primer Selection on Muzzle Velocity
Posted: January 13 2025 at 5:58am
That's an interesting result Brit, there's always so many variables when handloading for accuracy. I wonder what you would find if you tested primers from different case lots? I had an excellent recipe worked up for my LB using fireformed Dominion brass with Hornady 150 gr. SST bullets over Varget and CCI LRP. From a rest it would shoot 1 MOA. I eventually used up the 1000 primers in the LB and several other .303s I was reloading for and started with a newer case lot, same primer. I was never able to achieve the same accuracy again. Funnily enough, I have a chrono but seldom check each load's velocity, something that's going to change now that I'm retired and have more time.
