Have one in load development right now with 75gr VMax and H4350 and RL22 running them pretty hot looks like it will settle in somewhere in the low to mid 50 grains of powder range.
I have no idea what I was thinking so don't ask but I spec'd a 1-12 #7 Lilja. The Lilja and #7 contour I'm good with but the 1-12 not so much but that's why these things are threaded on and not welded on. I figure at around 3800fps it won't last long but it sure will be fun while it lasts.
Maybe this 1-12 will work out afterall. I'll get all that high speed stuff out of my system then after this barrel is used up I can settle in with a 1-8 and slow things down. Nahhh probably not but if I was looking for long barrel life I never would have picked a 6-284.
Reloaders nest has a far amount of information but take it all with a grain of salt an work up to some of those loads. I think I read somewhere here that some were starting to use RL17 with 6-284. Maybe do a search and go from there.