my .223 pokes everything to within an inch of point of aim......50-55grn it doesnt matter they all group the same. my .270 is better still.I did experiment on range over a bench...10 different rounds from 110-160 grns in weight both factory and reloads...100 mtr group was covered by a playing card...no good at 350 yards but at bush ranges it matters not a hoot.
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