I'm loading for a Winchester Model 70 Featherweight XTR in 7x57mm Mauser and I feel I might have a powder charge figured out but want to fine tune the seat depth. I've been shooting/testing at 100 yards distance but perhaps to see the change in group sizes easier I should try moving on out to 150 or even 200 yards. What do you more experienced load developer guys here think?
Also I have planned to shoot batches of ammunition with four different seat depths. 0.015'', 0.020'', 0.025'', and 0.030'' off the lands.
Current components are: 42 grains of IMR 4064, 140 grain Boat Tail Spire Point Sierra Game King (#1905), CCI Large Rifle Primers, and R-P stamped brass (started life as Hornady factory ammunition).
Any suggestions would be appreciated. I kind of feel like I'm headed in the right direction but not sure.
Also I have planned to shoot batches of ammunition with four different seat depths. 0.015'', 0.020'', 0.025'', and 0.030'' off the lands.
Current components are: 42 grains of IMR 4064, 140 grain Boat Tail Spire Point Sierra Game King (#1905), CCI Large Rifle Primers, and R-P stamped brass (started life as Hornady factory ammunition).
Any suggestions would be appreciated. I kind of feel like I'm headed in the right direction but not sure.