I'd like to have a bigger bore than .54 for elk. A .58 or .62 would really be great. Kibler's SMR tops out at .45, which is enough gun for the local coastal blacktails. I see that Kibler is soon to come out with a Colonial in .58, but I am really drawn to the simplicity and Spartan elegance of the SMR type guns. Perhaps after I build a Kibler SMR I'll have a little better insight to give me the confidence to scratch build a longrifle in a big bore.