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The published max Barnes TAC loads for 308 Win (51.2gns) and .30-06 (53gns) with the 130gn TTSX produce 3246 and 3165 FPS respectively. Both of the test barrels are listed as 24". I am curious as to why the '06 is almost 100 fps slower with 1.8gns more powder? Is the velocity difference due to...