I tend to get a headache every time I try to figure out all the different variations of Savage model numbers, but I've come up with yet another variation in Savage descriptions. I'm doing the research on a Savage bolt gun that I want to build, and all of my planning is on paper so far. I've been looking at stock manufacturers, trigger manufacturers etc and I've come to realize that some refer to the trigger guard spacing on a short action receiver as 4.400", and some say 4.410". Are there actually two different short action receivers that have only a .010" difference in screw spacing ?