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The biggest problem with the Barnes company is that they keep coming out with new bullets faster than they can develop load data for them. So their books are always obsolete.
However, they say that one can use original X-bullet data for the TSX and be safe. You might even be able to go one or two grains above book max for the X, but the printed X data will be safe as is. Do NOT use data for the coated bullets, only the original non-coated non-grooved X-bullet.
For the .308, my book doesn't list Varget, but it does give data for IMR and H4895 and IMR 4064, which are almost identical to Varget. For the 150-grainer, start at 41.0 and max is 44 to 45.0.
Do clean the rifle completely before you shoot Barnes bullets, and try not to mix other bullets in until you finish shooting the Barnes (due to the hardness difference between copper and jacket material). And do seat the Barnes bullets well off the lands, 0.050 being the Barnes recommendation.
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