Length of stock and eye relief of scope mainly. When you close your eyes and throw it up to your shoulder and get comfortable and then open your eyes you need to be looking right into a correct scope picture.... No head bobbing up and down, no forward and back -- no parallax, no thumb anywhere near your nose, a good cheek weld --- all automatic, with no effort. If you are the "generic shooter" that gun manufactures build their rifles to, then lucky you. For most others it needs looked at. One hasn't lived until he takes on a rifle that is too short for him.... a modest cartridge can become a wicked witch.

ESPECIALLY, if you utilize some of the friskier recoiling rifles, then the fit becomes critical not only to quick target acquisition and accurate shooting, but also critical to recoil management. IMHO, the lack of this latter item is flat out epedemic in the USA. For example, just last month on this forum, a 250 pound, 6 foot bruiser intimidated by a 270 ---- something wrong with that picture.....

I don't know if any of this will make sense, but that is what I mean.

EKM