It was Sako mounts that tapered front to back. In the days before the like of Kimber were available & Brno mounts were unobtainable, I ground the taper off the locking clamps on a set of Sako mounts to use on a Brno 602 in 416 Rigby. The rear mounts jammed into the blind dovetails on the rear bridge & did an effective job in stopping the recoil moving the mounts, at least for the time I had it.
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