typical break in procedure is: shoot 1 shot and clean (x5), shoot 5 shots and clean (x 3)... You can then do a 10 string if you wanted... but you're pretty good after the first 2 steps. As for the tack driver I have no idea... My 260 is pretty darn accurate 1/4 MOA @ 450 yards so far (hand loads though)... You should have similar results.
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