I have had 4 Vias breaks, Custom 257 Weatherby, 2-7 Mag Sendero's, and one 7 STW.
I have also dealt with the origional Vias and the new guy that bought the company.
I think that the problem that the guy is having with the 375 RUM is that it is simply goint to kick hell out of you, with and without a break, which is the real problem, not the break.
I have 7 different kinds of breaks, and truthfully, there is not very much difference in any of them. However, the gunsmiths are convinced that their particular brand of break is going to be the very best...hog wash!
To the fellow with the 375 RUM, you are going to get the crap kicked out of you one way or another with that caliber, and no muzzle break is going to take that much kick out of that gun.