I just received a box of Barnes .338 185 TTSXs to try out. Plan is to try H4895 and TAC initially. I noticed Ramshot listed the Fed 215 Magnum primer for TAC. I asked them about it and it turns out that is a typo. The testing was done with Win WLR primers. So, just a heads up. Not sure it really matters too much as long as you're working up. JB's article on loading the 338 Fed also listed the use of Magnum primers, maybe there is something to it, who knows. Also going to try the Scirocco IIs. Will go with whatever shoots better. Each of these bullets has an excellent BC (.432 TTSX and .507 SII) and will make the most of what velocity the 338 Fed has.