I have read several associated posts with regard to powder,and most suggest RL22 and H4831 are good. So, my question is this: Has anyone tried any of the Ramshot powders, especially Hunter; or, has anyone tried Vit.'s n550? The Nozler handloading manual shows the 550 as the most accurate powder with a 180 grainer. Also, does anyone know how temperature sensitve the Vit. powders are? Changing gears here a little with a couple of offshoot thoughts: any strong feelings about Federal 210M primers vs 215M primers in this cartridge? And, does anyone know if Lapua make brass yet for the 300 WSM? I appreciate anyones comments. Thanks in advance. Greg.