Okay lets look
Ruger #1 Leupold 6X
Savage 99 Leupold 2.5-8
Note the relation of the trigger to the rear of the ocular lens and that on the #1 the scope is almost as far back as it will go, whereas on the 99, as far forward. Matching the scope to the rifle is not that difficult since almost all manufacturers provide all the data needed.
As I said the only issue I ever had was putting a Trijicon 1.2-4 on a 375 H&H RSM as the scope itself is short. Had I used a K2.5, the offset ring would not have been needed.