I'm curious to what brand of brass everybody is using. I've had 1-2 firings in my stuff and the primer pockets aren't super tight any more. I'm using Norma brass and shooting 140 A-max @ 3175fps w/ 4831SC (215M primer). 26" tube on a Ruger m77. Retumbo and H1000 didn't have the accuracy I wanted. You guys are shooting a lot faster with seemingly better brass life. I'm wondering if it is the difference in brass or difference in powders. I know that velocity doesn't always mean pressure, but 200fps ain't no free lunch. Ill be trying the 143 ELDx in the coming weeks, so I've been sniffing around a bit