Been working w/ IMR 3031 & 457191 @ .318gns, in my 45-60 .
I mostly shoot 5 shot groups.
IMR-3031,,,,,, Primer ,,,,,457191 ,,,,,case OAL,,,,,OAL .
5rds.,,,,,,31gns ,,,,,,,FED LR,,,,,,.318gns.,,,,,1.870 ,,,,,,,2.270 ,,,HI- 1359 fps. ,,,LOW- 1334 fps. = 25fps.
5rds.,,,,,30.5gns.,,,,,FED LR ,,,,,,.318gns. ,,,,1.875 ,,,,,,2.270 ,,,HI- 1314fps. ,,,,LOW- 1293 fps. =21fps.
5rds.,,,,,30.5 w/ .4 Dacron ,,Fed LR .318gns.,1.870 ,,,,,2.270 ,, HI-1299 fps. ,,,,Low - 1283 fps. =16fps.
I am shooting at 50yds. @ 2 1/2" red diamonds ( dang hard to see ) , getting 2 n1 holes & some 3 holes under a quarter , just can't get them all together ( lol ).
These loads are for my rifle YMMV,, be safe.
Maybe need more coffee ,,, Hootmix.