I am trying to work up a load for some 170 gr. .358 dia. Kieth style flat base boolits. Just got back from the range after trying 12.5 gr. 2400 with CCI 550 primers. The accuracy at 50 yards was terrible. No sign of leading and very clean burning as far as powder residue. The gun was an 8-3/8" model 27. This is a new gun for me but used, around 1980 vintage, so I have no past performance to go back to. I did try some 158 gr. .358 dia. SWC gas check boolits with 14.0 gr. 2400 and CCI 550 primers. The accuracy with te 158 gr. at 50 yds. was ok but not great.
Anyone got any good loads they can share for the 170 gr boolits.