CAMOMAN: I thought a load i worked for short to medium range(upto 600yds)in 300 wsm
might be helpfull to you.I shoot a Win. Mod70 Stealth, and in this rifle it is wonderfully accurate and easily holds 3/4 MOA at all distances. Starting with winchester brass these are primed with Federal large rifle magnum match primers,setting off a charge of 63.5 grns of H 4350 Ext. This launches a 185 grn Lapua Scenar HPBT bullet. This load chrono's 2850fps. Although the Scenar is a match bullet, i have been reliabally informed that it is an excellent perfomer on game.expanding superbly. Well there we are, i hope this info will help you in your quest for long range varmints.
Good hunting to you all.