Customizing a field stock for a pump shotgun

[Highpower]

David, I'm not sure what I have qualifies as a "razor" saw. It is the combination blade type. (Rip and cross-cut.) It doesn't have a ridged spine. One of the problems I always have with it, is that it wants to jump around on the wood as I'm trying to start a cut. I found this video on YouTube, and even the guy demonstrating the saw had his blade jump as soon as he started pulling on it. And he's cutting on a square piece of lumber. I can't even imagine me attempting to hand cut around a slick surfaced, tapered, oval shaped stock without slipping and jumping around scarring up the wood.

It worked ok for cutting off the dowel rods I glued in though.