Tim,
I just used the Nef scope base. They fit fine.
I can take a picture if you would like to see how it fits.
Sorry, I guess I didn't "read" the part where you said you didn't use the base!!
Buying the base and rings is kinda spendy unless you needed the base for something else. I use the Durasight bases on my CVA Optima Elite barrels, they're a much better base than any other base made for H&Rs except the Warne, I wish they offered them. I'd be interested in the Durasight rings, but I hate vertical split rings, they're impossible to lap so a scope can be mounted properly.