Not sure how to proper ask but, here goes. My favorite rig has dropped off in accuracy. I've used the same COAL (Cartridge Base to Ogive) since the barrel was new. Have 900 hot rounds down the old girl. Guilt edge accuracy has gone. How much increase in length of throat, from original, is a decent give up and redo point? Or is there something that can be done to squeeze a few more rounds out of her? As close as I can determine throat has increased 0.047".