I slugged the bore and it Mic's @ .377. But thats 2/3 up the barrel; above and below that are noticeably easier to push the slug through. I'm going to cast slugs with Lee's 250 gr .379 mold. Thanks for the adviceMight be best to try flat nose cast bullets in about 20:1 or softer. You should be able to get better performance than jacketed with the softer alloy. I had a highwall in 38-55 and as mentioned, you need to check your groove diameter. Mine was .379" and with plain base cast bullets of .380" it shot under 2" @100. (Wish I didn't trade that one off:-(


















































