Really....must be one hot load for the 243. A standard 24'' using 100gr ammo is only getting 2920-2940 fps and you getting 2945 with the heavier 105gr in 20 inch? Some reloading guides say it(105gr) maxs out at 2800(out of 24-26) and thats more the speed you might get from a 243 wssm . I would say thats too hot for most stamdard 243 in 20"", esp if its got a low twist rate
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