Originally Posted by BrentM
I tested 215m and 210m with 55.5 to 56.5 gr Retumbo and from in the lands to .20 out. My rifle shot almost all of it at 1.25 moa and less. The best is around .75. Speeds ranged from 2925 to 3011.
The two groups with best results both shot .75.
56 gr to the lands w 215m
55.5 gr with 215m
56.5 gr to lands 1.25 moa
Seems like everything was throwing pressure signs though. Sharp crater edges on primer pin dents and extractor marks.
Brent, Are you getting any stiffness in your bolt lift? I'm surprised you are getting pressure signs at these charges. Here is what I get with 57gr loaded .070 off lands, testing Fed 210's vs 215's:
Fed 210's. 2915, 2915,2919,2923
Fed215's. 2983, 2981,,2976,2965
This is with a Magnetospeed
. Group size with with 210's is .25MOA, 215's is .25-.5MOA at 200 yards.I get about 30 FPS more with 57.5,gr, same accuracy, no pressure signs. This is with my 26" Cooper. My Savage LRH produces very similar results with the same loads and seating depth.