Working on getting one done so just need some feedback/advice. I was thinking 1-16 twist for 200-268gr bullets J and cast with a .376 groove. The original Win was 1-18" and the Ballards 1-20" Was thinking in a pinch factory ammo could be used.I have brass,dies + molds already.The smith here is big on gain twist but I'm not unless someone convinces me otherwise.