My brother got some kind of new type recoil device put on his 7mm.
The 7mm is worse thabn a 375 or 338 (have shot both, they light off slower, not nearly as nasty a smack as the 7mm which I owned at one time.
He says it tamed it to a zero issue.
Not sure what type, but it worked wonders, far better than the old rubber pads.