Don't really know but my opine is if it works.
Recoil does make the rifle roll in an upward motion pivoting from the recoil pad a mercury buffer angled down would have a negating effect on that motion much as porting does. Giving you a quicker second sight aquistion.
Bottom line felt recoil is what slams your shoulder first and is felt from a straight backward motion. To buffer that I would think you would have to have it installed inline with the rifles bore.