Hockaday2017
Active member
I Have a Bergara 24'' 6.5 PRC. Ive been working on handloads using Hornady brass and Hornady 147 ELD-M's with H4831sc and Retumbo. I chronographed them today and they were as follows:
54.0 Gr H4831sc CCI 200 Large RIfle Primers 2.860'' COAL - 1100 FPS
58.8 Gr Retumbo CCI 200 Large RIfle Primers 2.860'' COAL - 3700 FPS
Hornady Match Factory Ammo - 3500 FPS
I used Caldwells chronograph. My question is: What the hell is going on? Hornady lists max charge of Retumbo at 58.5 GR @ 3050 FPS out of a 26'' barrel. They list H4831 max at 54.5 GR shooting 3000 FPS. The factory ammo has an advertised speed of 2910 FPS so how did I gain 600 FPS from factory ammo and lose 1800 FPS on H4831? Or is it what I think it is and my chronograph is trash...
54.0 Gr H4831sc CCI 200 Large RIfle Primers 2.860'' COAL - 1100 FPS
58.8 Gr Retumbo CCI 200 Large RIfle Primers 2.860'' COAL - 3700 FPS
Hornady Match Factory Ammo - 3500 FPS
I used Caldwells chronograph. My question is: What the hell is going on? Hornady lists max charge of Retumbo at 58.5 GR @ 3050 FPS out of a 26'' barrel. They list H4831 max at 54.5 GR shooting 3000 FPS. The factory ammo has an advertised speed of 2910 FPS so how did I gain 600 FPS from factory ammo and lose 1800 FPS on H4831? Or is it what I think it is and my chronograph is trash...
