O.K. I just returned from the range. My son-in-law's 7 Mag with a starting load of 65 grians of IMR7828 went 3,325 feet per second. The bolt was very hard to lift and the primer was gone. The book said it would go 3,005 fps.
My 7 RUM is shooting slower (120 TSX at 3,650 fps). When I started working up the load, they were going 3,750 fps.
We are using from the same can of powder. Any ideas?
