For the .41 Mag experts, ...
I've got a box of Cast Performance's 265gn WLNGC boolits to load, but am not sure what the COAL should be.
Load books are showing COALs for 265gn boolits like 1.707 and 1.650 or 1.660.
However, I also have a box of Grizzley Cartridge Co.'s .41 Mag ammo loaded with that same C.P. 265gn boolit.
Took my calipers to these rounds, and their OAL averaged right around 1.550. The 'box-flap' velocity is specified as 1400 fps. I'm not intending to load these boolits that hot. I just wanted to shoot some heavy-weights at mild, 'plinker' velocities on some old bowling pins I've got.
Any suggestions? Thanks!