I see a lot of great replies here!
First off, I'm not a benchrest shooter - I use a shooting mat and go prone for serious work. Different targets at different distances with lots of wind adjustments.
I've also roughly followed the M118LR recipe for my Savage with good results - Sierra 175 grain MatchKings and both Accurate 4064 and IMR 4064 powders. The best thing I did was to sort my brass according to headstamp and keep everything in the reloading process as consistant as possible.
It may be be of some benifit for you to try some benchrest primers. I can't recommend one brand over another, but perhaps buy a box each (100 primers) of two or three different brands to try out. Maybe you'll notice a difference, maybe not.
Maybe it's been mentioned already, but after you've reloaded your cases so many times the brass will work-harden. At some point you will want to anneal the case necks and shoulders to soften them up again. It can be done quickly with just a few basic tools you probably already own.
Consistency will be your best asset. Keep a notebook handy and log any changes to your materials or processes.
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