Rifle fit relates to positioning your eye behind your sights in a relaxed unstrained position. And the stock has to be long enough to keep the rear sight out of your nose or the scope's ocular ring off your forehead during recoil in my opinion. Length of pull isn't too critical if the comb is high enough to get you behind the sights without having an unsupported head or having to dig hard with your cheek to line up. Position is also related to stock fit, which is why you see target shooters with stocks adjustable in just about all directions. Prone requires a completely different fit compared to off hand. Also related is how heavy a cartridge you are firing. Might want a little more length with a big nitro vs a .22 because you will probably fire the later more across your body which would be dangerous with heavy recoiling gun. If you are really long in the neck and shoulder width a little more length is reasonable. For a general purpose hunting or plinking rifle a fit much like a shotgun would be fine so long as it is fit to the sight line which is a bit higher than most shotgun ribs and if you are not a real stock crawler.
