The small objective as already pointed out allows low mounting and a decent cheek weld without a comb so high that the rifle can't be used with good express sights too.

For example my 375H&H has a comb height that works pretty well with either the low mounted Luepold 1.5x5 which has a 20mm objective or the express sights. Its not perfect with either though. If the scope were mounted higher I'd need more comb height to avoid loosing the weld. But then the express sights would be useless. The weld definitely reduces perceived recoil.

FYI there is about 3/16" clearence between the comb nose and the bolt. I would not want a monte carlo style stock not only for astetics but also because to me the straight style stock reduces felt recoil.

JPK

Editted: I also recall reading that with relatively low powered scopes such as my Luepold and others that the maximum useable light is transmitted even with very modest objective lenses. I recall that at 4x the 1.5x5 x20mm Luepold with its 20mm objective is transmitting as much light as the eye can use. I believe the source was a buyers guide in the SCI magazine.