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Obviously I can’t comment on any grouping for accuracy this go around but at least I got some numbers.
Powdercoated Lee 457-405-F (416gr actual), BHN11, COAL 2.120”, CCI350 primers.
16” barrel.
37.0gr of IMR3031 averaged 1472fps.
37.0gr of AA2230 averaged 1465fps. Slightly dirty.
40.0gr of BLC-2 averaged 1286fps. Very dirty
32.0gr of 1680 averaged 1460fps. Extreme velocity spread.