Robert Greenleaf - a retired engineer from Savage, avid benchrest shooter and frequent contributor to the now defunct Precision Shooting magazine did some testing with the 3-screw single-shot actions when they first came out and his results showed that the third screw offered no benefit what-so-ever. The third screw was essentially added at the marketing dept's request so they could use it as a selling point, and like most marketing hype it was just that - hype.
As far as using a stock that's been inlet for a blind magazine, it's not going to hurt anything or affect accuracy in any way. If the void bugs you, you can always glue in a piece of foam or a block of wood to fill the bulk of the space and then glass bed over it.
Bookmarks