Well a bit late since TT already ordered ABís, which will work fine as will many bullets from a 300 Win Mag.
The TTSX performs differently, far better and more consistently than than TSX. I only used the TSX a few times, but it really was among the worst performing bullets Iíve ever used. In stark contrast, after about 15+ animals, the TTSX has performed very nicely. My sense is it that it is softer and the tip must help as well. The entrance holes on a rib cage are 1/2Ē - 1Ē - that is the entrance side, exits are similar.
I swore off Barnes after trying the TSX, but someone encouraged me to try the TTSX and I am glad I did. The 308 175 SMK combo still has killed more for me than everything else added together by double or triple, and it still works well for me, but I would not necessarily recommend it for others.)
These are on a doe behind the shoulders with a 260 with 100 gr TTSX. I am picking this series on a doe as the smaller body mass with behind the shoulder heart lung shot placement is more challenging for this type bullet than a larger animal with a thicker diameter. These are very typical of the wound holes - not the biggest and not the smallest, but reliably through and through. The only TTSX that did not exit was my nephew shot a 200#+ boar through the shoulders with an 80 gr TTSX from a 243 and it stopped in the off side hide. I will try to take a photo of a 300 Win Mag with 165 TTSX combo this year.
Entrance inside rib cag view
Exit inside rib cage