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Seems to me the bigger the tube, the more light can get transmitted through the internal lenses. Of course, the size of the objective lens is probably more important.
Lessee. 1 mm = 0.03937 inches, right? Or, more usefully, 0.040 inches. So 30mm = 1.2 inches, right?
Would you agree that the greater the diameter of a tube, the stronger it is against bending?
I haven't used the "Long Range M1" scope, but I know that 400 yards the 4.5x14 works well. From what I read, many long range shooters use even higher magnification.
As with any high-power scope, heat shimmer during the middle of the day can create problems...
FWIW, Art
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