I'm using 35.5gr under a 300gr JHP, but it's also 1967 production a friend gave me 20# of I'm getting about 1870fps give or take with mild flattening of the primers. Unfortunately I'm getting a large variance in velocities (as low as 1720 and as high as 1910), but I suspect it's the Lee powder measure that may be at fault. I'm going to try hand weighing ten or so to see if that is the problem or not.