Copy the chronograph results. I do think/guess more velocity than the 2560 fps that I am getting with the TTSX 2000-MR is available. And probably a bit more using the flat base TSX with the same load. Eventually, I will load some TSX and compare. The 350 TSX has been impressively accurate in 3 rifles that I have shot it in with lower velocity IMR 4320 load.
I shot some and still have several boxes of the factory loaded Hornady 400 gr pre-bonded. I shot a few for the heck of it. But, my intention from to beginning was the 350 gr TSX. Then the TTSX 350 came out. I decided to give the higher bc TTSX a try. Mainly because the bc offered the higher retained velocity. In theory by my wants, it makes a pretty decent 250 yd moose or similar rifle.
It is very difficult decision for me to carry any rifle other than my 20" 416 Ruger when moose hunting in my area. The 20" 375 Ruger is the only one that gives it serious competition for that use.
