Re: .338 WinMag & 225gr bullets
I got best accuracy out of my factory .338 with RL19, about 73 grains with 225 grain bullets. That was 73.5 for the 225 partition, 73.0 for the Accubond. WW cases, Fed 215 primers.
Something funny happened between 200 and 300 yards. 100 yard accuracy was good. 200 yard accuracy was usable. At 300 yards I'd have been happy with the vertical dispersion ... maybe 3, 3-1/2 inches, but I was getting 11 to 14 inches of horizontal stringing, equal in both directions from center such that the center of the group was directly below the point of aim. Puffy < 5 mph breeze. My .220 Swift was shooting 2" groups through it while I was waiting for the .338 to cool between groups, so I don't think it was wind drift or mirage.
Oh well, time for a different gun.
Flex is for people who don't have lockers.