I consider the 1/32" twist to be for conical bullets or sabotted bullets only - it is too fast a twist for decent performance with round balls unless you are using squibb-loads only for plinking or close-range target practice!

On the other hand, a 1/60" twist (and some even slower!!) will often perform exceptionally well with big full-bore diameter conical bullets as well aswith heavy charges behind round balls.

Take a look at this group - a typical one fired with my .50 cal. Hawken using a heavy charge and a 370-grain Maxi-Ball. This barrelhasa 1/72" twist.

Ihave no doubt that a Lyman GPR in .54 cal. with a 1/60" twist would prove adequate for all game in North America, regardless of whether you chose to shoot PRB or big heavy conicals in it! (Remember, the Civil War Springfield and other .58 rifled muskets of that era shot530-grain Minie balls,most of them were rifled 1/72", and could hit man-sized targets out to 400 yards!!)