Re: Velocity Ceiling for Barnes TTSX? Fiftydriver?
Guys over on 24hourcampfire.com are running TSX and TTSX out of their 257 Wbys at 3600+ fps, I'd say you are fine with your 6mm at any velocity you can achieve. It is a monolithic bullet and since Barnes added the three grooves on the shank to allow metal to flow when displaced by the lands I have heard very little bad about them.
The critters have to win every time, I only have to win once.
NRA Life Member