Welcome to LRH . someone will eventually chime in with some good advice .
but until then i'll recommend a few things if thats okay .
A good trigger say from 1 1/2 lb to 2 lb at the most in my opinion.
A good bullet with a high bc for your .308 I would give the Amax a try or berger.
An hogdon extreme powder specifically if you plan on practicing in HOT conditions .
Last but not least get real picky with your load development (this one i'm learning at this very moment) . Sort brass, anneal make em all the same length and so on .
Note this is just what i've read but if you've seen the targets that broz shot with the new .338 bergers he's doing something right and this si just a few of the tricks he's doing.