I recently sold a Frontier rifle to a friend. He wants to have it bored out to a smoothbore. I gave him a good deal on it, so he would only be into it a little over $400 with the boring. It is a .50 cal. I'm not sure if the barrel diameter is 7/8" or 15/16". Hopefully somneone here with one can tell me. Depending on the barrel diameter, what would it be safe to bore it out to, taking into consideration the dovetails for the sights and underlugs? I am pretty sure it could go to .54 cal/28 ga. safley. How about a .58cal./.24 ga using a patched rd ball or 7/8-1 oz of shot over 70-75 grs of 4f poswer. Thanks for any help.