RE: TC White Mountain Carbine
I have one, the early ones were 1:20, later ones were 1:38, maybe TC could tell you what you have based on the serial number. If not you can figure it out with a tight fitting jag on a ram rod and just measure.
I'm presently shooting 385gr Hornadys and they group nice over 80grs. of 2F BP, but the recoil in that little (light) gun is substantial and the bullets start dropping quick out past 75 yards. I'm going to try some 325gr. REAL bullets soon that I hope will shoot good and not pund me quite so much.
The gun it's self is a dream to hunt with, you can walk all day and it's like you didn't even bring a gun or forgot that you had. They can be fussy about what they like to shoot but not terribly so..
Doug