There is not enough difference between 1/32" and 1/28" twists to make much difference, unless you are going to use coniclas at the extreme edge of length and weight. Any conical that is no longer than around two diameters that hasa reasonably long bearing surface to engage the rifling should shoot pretty well in either. It is much more difficult to stabilize a long conical that a pistol-type bullet in a plastic sabot.

I have a .58 with a 1/60" twist and it shoots the Lyman 570-grain, 57730 Minie Ball very accurately at 100 yards with 120 grains of FFg. It is a flintlock fullstock Hawken-style. MV is 1200 FPS (36" bbl). Needless to say, recoil is "noticeable"



Lyman 57730, 570-grain bullet between two .45/70 rounds

Oh sure! That sounds good. But is 570 grains of lead at 1200 fps enough to kill a deer?

I have two rifles with 1-32 twists. They shoot REAL conicals very well. They also shoot maxiball real well. In the sabot department they shoot a 300 grain XTP pretty good too.