Mine is a Cooper 1 in 9 twist and shoot the 142 gr Sierra Match Kings with 47gr RL-22 Fed 215M set .005 of lands shoots 5 shot group under 3" at 600 yards. Be careful as 6.5 x 284 are real BARREL BURNERS and only last 600 to 900 rounds.
Mine is a Cooper 1 in 9 twist and shoot the 142 gr Sierra Match Kings with 47gr RL-22 Fed 215M set .005 of lands shoots 5 shot group under 3" at 600 yards. Be careful as 6.5 x 284 are real BARREL BURNERS and only last 600 to 900 rounds.
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