Referencing this site: 6.5-284 Cartridge Guide it appears that H4831SC and H4350 are the 2 top powder choices for bench shooters. So why did a few of the well known video guys get on the Retumbo and H1000 wagon with this caliber? I have all 4 powders on hand and I have 300 JLK 140 VLDs and about the same number of Berger 140 VLDs. I drew late season mule deer for CO which I've never done. I have 4 new rifles, 2 in the safe, 2 on the way, that have not been fired. 2 are going with me but I haven't decided which 2 yet. So, somewhere along the line the guys at BOTW and Gunwerks decided to shoot Retumbo, then I think I heard they moved to H1000. A trusted, very experienced shooter I talk with advised that he noticed excellent temp stability with Ramshot Magnum and it was on par or better than the Hodgdon powders, but I cannot remember his statements with regards to accuracy but it was not bad. My 6.5x284 has a Bartlein 24" barrel and I have limited time to get this rifle ready. It is unfired. So, question 1 is would you use a regular rifle primer or a magnum if choosing H1000 or Retumbo, and question 2 is which powder would you opt to use first if you had the following on hand and plenty of it: H4350, H4831SC, H1000, Retumbo, Ramshot Magnum? Thanks for your time.