Retired2021
Active Member
I have been developing a load for a 7RM using Norma brass, H4831, Nosler 150BT and CCI #34. I had a consistant velocity of 2974 with single diget ES and SD and group of 3/4 MOA. I ran out of the CCI #34 and opend a new brick of CCI #34 (differnt lot) and my group went to 1 1/2 MOA, velocity remained around the same (2985) but ES was 29 and SD 13.5.
I am fairly new to percission reloading, so I don't know if the different lot of primer caused this, or should I look for some other problme.
Help please.
I am fairly new to percission reloading, so I don't know if the different lot of primer caused this, or should I look for some other problme.
Help please.