I think my issue is the 35 Whelen barrel diameter was too great for the UM unit to property tighten down. It simply slid further up the barrel to the point where a couple of my slings weren’t long enough.
The solid band in the standard U/M set for the 7600 is indeed too small for the .35 cal (Rem. or Whelen) barrels. A split band for a "magnum" contour works fine. Don't remember which set I used off the top of my head.
