I recently got my new build in 300 WSM. Trued Rem 700 action, Timney trigger at 1.5#, Bartlein #4 contour barrel, new heavy recoil lug, Defensive Edge muzzle break and Greybull Precision stock. I am shooting 215 gr Bergers and had hoped to hit 2850 fps. The only powder I have been able to do that with is Reloader 17 with .5 moa groups at 200 yards and 2874 fps. Extreme spread on 3 shot groups is 14 fps. The only problem is I don't trust his powder as I have read to many reports of temperature sensitivity issues and pressure spikes. I have tried both H4831SC and H4350. Can get about .6 moa at 200 yards with each but only about 2700 fps with each. I have worked up to 67.5 gr of H4831SC and 63.5 gr of H4350. No pressure signs with either yet. How suggestions on how much higher I can go with these powders? Are there any other powders and loads I should try. I used these because I have a supply of each and it is so difficult to source anything today. I did get my hands on some of the IMR 7977 which is supposed to be for the WSM's and can get velocities up to 2800 fps with very compressed loads at a max of 72.0 gr. but accuracy is not good. I should mention this build is on a long action. I am using Norma brass and Fed 210M primers. Bullet seated out to 2.51" at ogive with COAL of 3.282. .056 off the lands and have experimented with deeper seating as well. I would appreciate any suggestions any of you may have.