Benchrest 50 caliber Inline RB match rifle ?

George, measure the depth of the grooves, that kinda gives you a starting point. Like Gary says take a mic to the fabric store and buy a yard of.015, .016/7 , .o18, and .022” cheap stuff to experiment with. I found with all of the muzzle loading match shooting that I have done that a dry patch on top of a damp bore gives the tightest groups. I used FF in dry weather and FFF in wet weather. Of course loads were established by group sizes in those weather conditions, 100's of shots were fired. Back East there was a match at 25 yards open sights only. I used a 44 cal barrel from Numricks that ended up with a bore size .420” and a 36"twist, 60 grains of FFG and 55 grains FFF shot bug holes with .010” table cloth material. My peep sighted match gun was .445” Numrick 48” twist (lapped) with .017” flowered ticking. The matches that I participated in were nearly all day affairs so the big caliber-ed stuff was too hard on the shoulder. Most matches were shot with spit patches except when the chips were down at the bench and then I shot dry patches. I would clean every shot, one wet patch in and out, no scrubbing and followed by a dry patch in and out - no scrubbing, then the dry patched ball in on the slightly damp barrel. In general I found that slower twists require more powder. My new match (2011) shoots one hole with a load of 120 grains of FFG, but I can't stand the recoil and have been playing with 90 gr. of FFg. I have a lot of different thicknesses of ticking, drop me line and I'll send you some to play with. I have attached a target from the “quick twist) 42 cal muzzle loader. Warmest, Reg