About 6 years ago at a small GS I found a CVA 54 Mountain Magnum in the box and bought it for $40. I have a good collection of C&R's and several BP's for an occasional BP tag. I built the kit and the gun is beautiful, but I have yet to fire it. It is a heavy rifle with an early 4 digit 47xx SN and am considering use for a coming hunt. As it is a 54 and doesn't have the twist rate on the barrel What should be some starting load guide and would it take conicals? If I don't shoot it, I have a TC Black Mtn Mag 54 I have been using what is the market on it as new -unfired. I SN's indicate it was made in 1978 and has the made in Connecticut roll marks and supposedly a Green Mountain barrel. Is that true?