I know exactly what you're going through. I've been working for the past 6-8 months trying to find the 'right' load for my 300 RUM. Hook up with Bigcountry and listen to what he says. He's been thru it all and helped me work thru it. I've discovered that my particular rifle, Rem 700 BDL Stainless, doesn't like it when I turn up the heat. The faster I try and push a bullet, the worse my groups get. I've finally settled on a 180 Nosler partition over Re22 with a Fed mag primer. This recipe gives me sub moa at 100, 1 1/2" at 200 and about 3" at 300 yards. Granted, this isn't the best shootn rifle, but it'll get me in the woods next month for elk. I've even seen a difference in the 2 different styles of 180 partitions and the way my rifle shoots them. I disagree with 300winnie and using the ballistic tip. I personally think that the 300 RUM will push the BT too fast, just my 2 cents, especially if you're pushing full power loads. Good luck and keep us in on how you're making out.