I just got 20 of these beauties to play with ( Thanks Robert..!!) Looking for load info. to approximate 2100fps out of my 21" 458 win. mag. bbl. ALSO...What's a reasonable C.O.L. for these?? I put together 4 test rounds for feeding purposes, and find that seated "out" @ 3.55"-3.60" they feed REAL well.
Thanks,
Don

Right out of the Barnes reloading book:
RL7 57-62g, 2084-2267
IMR 3031 65-70g, 2087-2247
there 7 powders listed and all run from 2084+ to a high of 2284.
These were gotten with a 24" Shilen barrel