RE: What ML for Roundball
If your a dedicaled roundball shooter look for that slow twist Cayugad mentioned. 1 in 60, 1 in 66 something like that. The GPR is a great gun but heavy.
If you opt for a 1 in 48 twist working up an accuate load is a bit more touchy. I have a TC renagade in 54 and It took a little work to get it to shoot the round ball well. If you do do a 1 in 48 you can also shoot maxies and a 54 with a heavy powder charge anda heavy maxi is big medicine.
To make my renagade shoot well with roundballs I had to stay at 80 or 90g equivelients of pyrodex and a very tight patch fit.
Roundball don't have high balistic coef. so they loose speed rapidly and they don't have great sectional densities so they don't penetrate like so more modern projectiles. (they do mushroom nice tho). 54 cal would be my choice, 50 would do in a pinch but IMHO 45 cal is a real experts caliber on a deer.
Some how when I switched to a scoped inline I lost a little something.