I just built an underhammer rifle in .40 cal (H&A style), and am interested in hearing from those who shoot that caliber. I've only shot .54 to this point. I have a 42" Colerain swamped barrel in 1:48 twist. I almost went with a Green River 36" 1:66 twist, but really like the swamped barrels.
What are your barrel specifications?
What's your favorite load?
Thanks for your input!
What are your barrel specifications?
What's your favorite load?
Thanks for your input!