Scratching my head with 300 RUM
I went to the range today which is at 5500 ft in elevation. This time I wanted to try out the 200 gr Accubonds with Retumbo and Ramshot's Magnum powder. When I got to the max loads, this is where things got strange with the Sendero
200 gr AB with 98 gr of Magnum powder gave me velocities of ...
AVG Velocity is 3,399. That seems fast, perhaps too fast? 2 out of 5 shots showed signs of too much pressure by slightly sticky bolt and half moon shape on the rim of the case. The temp was 48 degrees. When I hunt it might be 80 degrees so should I back off a grain or two?
200 gr AB with 95 gr Retumbo gave me velocities of...
AVg Velocity is 3,269. This seems about right on without any pressure signs.
Both had about the same accuracy. Has anyone else experienced high perfromance from Magnum like this before?