Bullet-wise, I'd use 69gr Sierra MatchKings for that barrel and range.
Varget is a popular powder (and mostly what I use). I've used varget out to 300 yds before. I believe that load was Lake City brass too (92.0grs for all/each case) - but the brass was new. Look also at Relaoder and I believe H414 would possibly be a good choice too.
I'll pass on telling you what charge to throw (as this will likely be different for each rifle). Given the distance, I'd do a ladder test and start with 23.5grs of Varget and work up. I suspect you'll find a good load somewhere in the mid 24's.
Also load to the lands (assuming you know where that is).
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