The biggest factor I have found to promoting accuracy w/TSX is how far off the lands you load the round.
It may take you a couple of these rather pricey boolets
to hit on the right length but once you do, they are quite capable of sub MOA accuracy.
I start at the recommended .005 " off using the Stoney Point set up but others have used a magic marker to identify when they hit the rifling and use your micrometer from there to start backing off.
In my Mod.70 .243, the sweet spot is .010 off.
In a Browning .270 it doesn't seem to matter all that much.
Load a few, say 3, starting at .005 and go up or/and down. Then take them to the range and see what you have.
Gary