Just slugged barrel on new to me old Winchester 1886 in 38-70. With dial calipers and digital calipers I get .3855, and .386 on digital. I have a mold from Accurate that drops a .380 260ish gr. bullet for a 38-55. I’m not sure I’d be able to chamber a loaded round that’s sized to fit groove. My options before buying mold. Shoot soft lead w black, maybe it’ll bump up. Inside neck ream. Try patching a grease bullet. Am I forgetting anything else? Thanks in advance.