You are there! I shoot 5 - 3 shot groups load testing, 5 shot group test you, the gun, and the conditions. If you are not shooting match with 5 shot groups, don't shoot them. If your load is shooting 0.3" regularly and a 0.1" now and then. You are there, stop working, just shoot it. I know I have been there. My first build was a 6AI. I wore the barrel out looking for that 0.1" group every time. A hunting gun with a round bottom stock, is not going to shoot 0.1" all the time. I looked back, after the barrel was gone, most of my groups were good enough.
Get you some clays or steel and shoot long range.
Mark Schronce