The faster you run a TSX the more reliable it will be for opening up fully. I want that bullet to open as quickly as possible for more destruction along the bullet path as possible. Unlike many other bullets the TSX and TTSX do not typically shed weight in in effect secondary wound channels like cup and core bullets or Nosler Partitions and accubonds and most other bullets do. That large for caliber frontal concave area on the Barnes bullets driving through I believe is a large part of why they have such a good reputation for effectiveness, much like a Slow moving Pistol bullet with a large meplate like semi Wad cutters bulldozes/rippign its way through is micu more effective than it seems like should be the Barnes goes about the same but at a faster veolcity, which is also neded fot that bullet to take on the shape. Dang I goe long winded there.

The TTSX are supposed to open better at lower velovities than the TSX does. It is not the muzzle velovity I worry about as much as the velocity at impact with the gamme.

Just my opinion and who knows I may be entirely wrong. Fluid dunamics was not my strong point when getting an engineering degree.