Riflecrank,
What velocities were you getting with the 375 WBY and the 270 & 300 grain Barnes TSX ?
The 375 WBY is an intriguing cartridge.
ldmay375,
Sorry, but the TSX did not exist when I settled on the 300-gr Nosler in the .375 Wby to match the factory ammo.
I later shot TSX bullets in the .375/.338 Lapua and .375/404 Jeffery.
Fine bullets, the TSX and TTSX. You will not go wrong there.