I've heard claims from a reputable sources, that the TSX are typically undersized. Yes, this will lead to less fouling, require larger charges, and get high muzzle velocities, just as their web site says, but at a high price in barrel life and probably accuracy.
If you have some TSX on hand, I'd be very interested in seeing your diameter data, to see if this is really true. Or, if you want to send me a single bullet, I will mike it, post the results, and send you back the bullet.
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