I been trying a few Buffalo SSb 325 gr. in my 1977 t/c flinter barrel
and with 85 grains of goex 3F I can drive 3 shots in the same hole with peep sight at the 100 yd target from the bench.
The bullet/sabot seem the best I ever seen the gun shoot.I own it for about 15 years original stock Hawkens but flip it into a PA. hunter stock with a single trigger.I did some honing to sear and change the sear spring the trigger breaks at 2 3/4lbs.
I will say Patched R/B with .017 pillow patch material and 90 gr of 3F will do well at the 100 yd but not as good as the buffalo SSB.