A reamer with the appropriate freebore works wonders in the 7 stw.
I had a reamer ground with .020 freebore set up for the 120-150g bullets.
120g ttsx and nosler solid base lead tip, and ballistic tips at 3800 and 3850 with three shot groups in the 2's with 8-32 target scope using R#22 and IMR 7828, fed 215's, winchester brass.
140g Nosler Combined Tec bullets at 3600 in a 26", 9 twist is normal, add 100 fps for the pac nor three groove super match 11 T in a 27" tube that is twisted especially for the 140g Nosler C/T bullet.
I, brothers, cousins have never had a deer walk off with one of the above loads out to 550 yards, and some big Kansas deer flopped on the spot. We put up a food plot 500 yards from a stand on a power line, and we named it the STW stand, many, many deer were killed on that food plot, NONE taking more than a single shot.
The first 7 STW I had was right after Lane Simpson came out with the article in Shooting times magazine. We fire formed 8 Rem mag brass with the 120's shooting 1/2" groups out of the 26" hart barrel, .020 freebore reamer with R#22 and fed 215's. Cousins are still shooting those barrels.
I ran into some PMC 300 Weatherby brass that I formed brass from, and it is very, very tough brass.