Co-worker was family friends with owners of Barnes when they first came out with the X bullet. Of course I bought a box and loaded a few. 10 rounds convinced me they were not a good design- erratic pressures, poor accuracy and barrel fouling. Barnes got the word from a ton of negative feedback but it took a few years for that to sink in and for them to correct the problem. Drive band technology incorporated into the TXS design solved the problems. Odd it took so long to acknowledge the issue and make the design changes.... drive band technology for monolithic projectiles, including sabot'd artillery rounds, has been known since at least the Civil War or earlier
The TSX is now one of my go-to soft points. Kind of reminds me of Hornady being in denial for years about issues with their original DGX bullet before correcting the design flaw- a bad rep that lingers to this day