Dan depending on how little run-out you want ,I find, the cheapest was to greatly reduce run-out in a saami chamber is to use a Redding body die to size the case and bump your shoulder and a Lee collet die to size the neck. Works great for me. Low cost as well.
This video series is pretty good. The guy is not shooting benchrest, but is doing long range PRS type shooting. The same techniques will get you started. Don't let all the experts scare you off.Are they’re any good reloading videos maybe on you tube for reloading for benchrest start to finish? If not that makes a good title for one of you to produce one.