N frames will not have the same problem as the older model 66's had, as there is plenty of metal around the forcing cone. The cases will headspace on the outer rim of the cylinder and will work fine without moon clips. I don't have an R8, but I have three 627 8 shot guns and find moon clips to be a pain when standard range shooting, so don't use them. They are darn handy if using the gun for defense purposes, or competition.
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Richard Gillespie
FBINA 102
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