In my pre-64 Model 70 Featherweight .308, 50.0 grains of TAC and the 130-grain TTSX resultedin 3106 fps and 3-shot groups averaging .63 inch at 100 yards.

TAC is very temp-stable in the cartridges it was designed for, the 5.56x45 NATO and 7.62x51mm NATO--more commonly known as the .223 Remington and .308 Winchester.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck