My 300 wsm model 70 stainless classic just will not shoot better than 4" at 100 yds....and that's on a good day. And I have had other shooters at the range try it too. So, it's not just me. I had a Burris Fullfield II 3-9x40 scope on it originally, with Burris mounts and rings. I recently replaced it with a Leupold VX-III 3.5-10x40 (Boone & Crocket reticle) and that didn't help.
It is the same with 180 gr. and 150 gr. rounds. I have shot Federal Premium ($42/box) shells, Winchester Supreme ballistic tip, and Winchester Power Point shells...none of them will pattern like I think it should.
This is the first center fire rifle I've owned and I thought...maybe it won't shoot like my .22's or my .17hmr (They are tack drivers). But I know other hunters who have the same set-up and consistently shoot 1" groups at 100 yds.
I did take a 15" Antelope with it at 218 yds but it didn't hit close to where I put the cross hairs. The first shot took out his throat, costing me a new cape, and I had put it right behind his shoulder.
Any suggestions would be appreciated. Thanks!