I'm not convinced you need a forward lug on a 416Ruger, especially with the large recoil lug bearing surface of an M70 receiver. I'm of the opinion that proper bedding in a good stock would be more than ample without the second lug.
Best
Gary, given the circumstances of your 416 RM build using the EW stock with aluminum bedding block/skeleton, I would agree. However, I'm looking at using the original, wood, cross-bolted, Safari Express stock - at least until budget allows me something different. The secondary recoil lug would ease the anxiety of "when's it gonna split".