Originally Posted by HunterGreen
Does anyone honesty have and chronograph a 7mm mag in a 30" barrel ???
Is so what speeds are you getting ??
I used to shoot a 7 mag in competition that had a 29.4" barrel. I used 168gr SMKs and loaded 66.5
grains of H 4831 for 3200 ft/sec. I bumped it a little and got 3254 but in hot weather it would blow the primers (To Hot) so I would be VERY careful when you get in this neighborhood.
Also I used DWM cases because regular brass would not hold up for 2 or more shots.
I do not recommend using loads this hot and would suggest that you start low and work up until you see pressure signs and back off 1 grain. Velocity will be different in different barrels so you will just have to live with what you get.
If you are not sure about the chroney results, do a bullet drop test from 100 to 600 yards and this will verify velocity.
J E CUSTOM