In my quest for accuracy previously i slugged the muzzle end and got .4315 so i lapped my sizer to .4325 and used that, i was getting 4 or 5 moa but i was using irons so i was happy didnt think it was the guns fault. Then recently i put my best leupold on it with good rings tightened everything properly ect. And still shot same size goups. So i thought id measure my throat because everyone says size for the throat for cast not the grove dia. So i did a pound cast in the throat area and uh, i dont have one.
The groves of the rifling at the begining of the bore measure .4325 then it just angles up to the chamber size in one go. So what should i do just up the sizer to .433 or .4335 ? Why does it not have a throat