I am in a slump and do not now know what to do next.
I've made some [constant] 58 gr., 49-49-2 Pb-WW-Sn, RCBS 22-55-SP's, to be water quenched after PC, [variables] gas checked, PC'd with Smoke's OD Green, and sized to 0.225", and PC's some with Smoke's Bacon Grease, not sized, not gas checked, 0.226", and loaded STANDARD JACKETED LOADS (ladder loads) of Win 748 powder (23.5 grains ~ 2700 fps book velocity to 25.5 grains ~ 3100 fps) in 0.5 grain increments.
The first three sets of three, nine in each, cast rounds from a Handi-rifle Standard 1:12 twist barrel and a Bull 1:9 barrel found their respective targets and made "decent" but as yet unacceptable groups (best ~2.5 MOA @ 100 yds).
EVERYTHING thereafter DISAPPEARED. None of the next 6 rounds for either rifle (12 rounds and then some others) found any portion of the 24" x 36" white drawing sheet over cardboard backed target. Using 60 grain jacketed Nosler Partitions for double checking, the scopes on each rifle are still dead on the center of the sheet.
Did the cast projectiles disintegrate? At 10 yards, additional [constant] cast boolits over 25.0 grain Win 748 powder put a hurtin' on a 12" diameter (nearly dead) Sable Palm tree, blowing out its back side. Beyond that distance, IDK where the projectiles went.
If jacketed bullet powder loads (>2500 fps say) are too hot, and cast boolit manual loads (up to 1200 fps say) are cold for PC'd boolits, WHERE do we find published data for PC'd boolits?
Are we WILDCATTING here in the middle ground of 1200 fps to 2500 fps? Is there a resource for what has been tried, notwithstanding a specific barrel reacting independently, so reinventing the wheel isn't necessary?