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You're gonna' be hard pressed to beat the Berger VLD 80gr bullets with your barrel. Some people claim success with the Berger VLD 90's in a 1:7 twist barrel, but my experience with them has been frustrating because of inconsistency. You might want to try them though. You could be one of the guys who can shoot the 90's with accuracy and consistency out of a 1:7 twist barrel. If so, that would be great. Otherwise, stick with the 80 VLD's.
I have found good results with both Varget and Vihtavuori N-140, but plenty of other powders work too.
But finding a good bullet and a good powder is easy. Unfortunately, using high quality bullets and powder isn't the whole answer. You must figure out how to put them all together. You should try your best to make very high quality ammo because you can be sure the guys winning at your range are doing just that.
They're doing things like careful case prep including trimming, primer pocket uniforming, flash hole deburring, accurate sizing, chamfering, weight sorting, volume sorting, and so on. They may also sort their bullets by weight and/or shape. Some may point their bullets and/or Moly coat them. Many are most likely weighing their powder to the nearest kernel and a few nuts might even being cutting powder kernels but I try not to stand too close to them.
One thing you can count on is that the winners have done very careful load development to find the proper charge weight, seating depth, and neck tension to optimize precision and reliability. You need to do the same because even at low-key local matches the winners are working hard to make the best ammo possible within the limits each shooter has for his personal budget and sanity level.
The sad truth is that none of this stuff will do you much good unless you learn to read the wind I know all about this unfortunate fact from bitter experience.
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