I used it in a 300 WSM and it does what Hodgdon lists.

Load is 64 grains 100V, WLRM primer, WW case 180 Sierra GK five shot velocity was 2972.

Same load but with a 180 Barnes TTSX five shots went 3030
FPS

Rifle use for this test was an FN Patrol Bolt Rifle 24 inch barrel.

The grooves cut into the Barnes bullets must reduce drag by a large amount to have a 60 FPS difference.