It’s pretty hard to find “any” Barnes .375 mono bullet in most gun/sporting goods stores. Heck, I even have some difficulty finding .338’s for my wife’s rifle. When I do find them, I get as many as affordable.....”hoarded-up” quite a few, over the years!
Unless you have a specific desire for the TSX’s, you may consider the 270 LRX! They should give much better long range performance and “reportedly” give good expansion at a lower impact velocity! I’m running 250 TTSX’, with great speed and accuracy.....but “only” because, I “hoarded-up”, before the 270 LRX was introduced. “”Hoarding-up”.....can be a “double-edged” sword!
Good Luck in your quest! memtb