My post probably won't help much. The only thing I know about Nill grips is that they are European, wood and very expensive.

I do have a .460 Magnum and the rubber grip works tremendously well, and this grip is specific to X-frames and has an insert designed to improve shock reduction.

I had no idea that Nill made grips for a S&W X-frame, I can only imagine that they would be even more torture on the hands than they are sure to be on the wallet.

Probably look gorgeous, though.