RE: Lyman Great Plains Flintlock Rifle
I think you'll like the Great Plains. You didn't say which barrel you're getting, but the regular Great Plains is a 1:60" twist, which is quite accurate with roundball (and is the barrel that I have), and the Hunter is a 1:32" twist, better for more modern sabot style loads. One thing to pay attention to is the owners manual. They specify a max of 70gr of FFF and 90gr FF for .50cal roundball and 80gr FFF and 100gr FF for .54cal roundball. If you choose to use a maxi ball instead take 10gr off each of those max powder charges. Enjoy!