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what I would probably do is hit the range with all barrels and work out exactly how much and where to adjust for each barrel
once that's done you could change barrels and adjust scope as part of...

Cz is my vote (for a new rifle) never really liked anschutz sporters unless they have the match action i find the standard sporter action quite clunky
Cant to wrong with brno model 2 or 1 model 1...