I've deer hunted with a Rem 700 270 since I was a kid. It's always had the same old Leupold VX-2 3x9 on it and its always shot where I aimed it. I recently bought another Rem 700 but this one is the XCR2 in 300 WM. I mounted a Viper PST 6-24 (2nd focal plane) on it. I went to shoot it for the second time today and I'm a little frustrated. On the 1st outing, I tried, to the best of my ability, to follow the barrel break in regimen. Well, after probably 70-80 rounds, the gun will not shoot in the same place twice. With Remington Core Lok 180 gr., it does ok at best. With Hornady Superformance 180 gr., it's a 3-4 in group at 40 yds. I'm shooting off of a Lead Sled and I can't imagine how the gun could be any steadier. I've read (mostly here) that certain ammunitions shoot better in certain guns. I get that. Maybe I haven't tried the right one but should it be that bad? It does have that ole cheap plastic stock on it. Could that be the problem? It just seems, at least to a layman like me, that custom stocks and Timney triggers are a little over board for someone who's longest deer kill is about 250 yds. Any advice? Thanks a lot.