Rather pissed off: First run out with the 300 for many months yesterday. Groups (at 100m) ranged from 1.1 to 2 MOA. Impressed that I have managed to tune my accuracy with this rifle from 0.5MOA (factory) to 2 MOA with handloads! Trying to find something to blame: PART 1: This rifle’s only had around 130 rounds through it; copper colouring on the lands is obvious. After 1 hour’s worth of patching with Barnes copper solvent, the patches were still coming out blue. Have I found my accuracy ruining culprit? I’m going to order in some Forrest bore foam to really dig the rest of the copper out. I’ve been virtually exclusively 308 until I bought this 300. Is this rate of coppering normal for 300 win mag? PART 2: To compound the error chasing problem, I was testing a new load too(!): 180 Accubond over 78, 78.5, 79 and 79.6 grs N165 with Fed 210 primers. In powder charge order, these shot 1.1, 1.4, 1.8 and 2 MOA. Would the next sensible thing be to change to Fed 215M primers? (210s were a deliberate choice because I have read that some people have noticed reduced velocity spread with non mag primers –reckon this is the least of my concerns when I’m shooting into 2 MOA! ) Any thoughts or advice gratefully received!