I think of TAC as a spherical 4895 rather than as a direct proxy for Varget.
An earlier poster mentioned 2520, which is slower than TAC. I use 2520 out of choice, not necessity, in my F/TR .308W with 178 Hornadys. If you can find Belgian-made 2520, buy it. IMO, it's a tad better than the ST Marks version. I think all TAC comes from Belgium.
At the end of the day though, these days, we have to work with what we can buy.
An earlier poster mentioned 2520, which is slower than TAC. I use 2520 out of choice, not necessity, in my F/TR .308W with 178 Hornadys. If you can find Belgian-made 2520, buy it. IMO, it's a tad better than the ST Marks version. I think all TAC comes from Belgium.
At the end of the day though, these days, we have to work with what we can buy.