I can agree with this statement.
A 7in suppressor with brake end cap, recoils about like a bare 9" can on a saum or smaller cartridge, step up to the big boys like a Norma or Rum yeah you need a 9" can, or better yet some the 338 cans on market.
Diameter helps, a 1.5" 7" can VS a 1.75" can at 7" makes a difference. I've got 8 cans now from 4 makes, 6" - 9" in length, 1.5-1.75" OD, some with brake end caps. They all feel a bit different. I am really liking the dead air XC line with the ebrake. Not much louder and noticeably less recoil. I'm still waiting for a few Abel theorem suppressors that supposedly have less recoil signature VS others. Their baffle profile gives less recoil pulse in testing, we will see.......