To answer your question of what are M1 knobs, this a VXlll 4.5x14 Long Range Target with M1 knobs:
I think this would make a great scope if you need to hunt closer animals also.
It has the TMR reticle which has been great at the range.
I have not had a chance to hunt with yet and am concerned that the TMR will be useless at dawn or dusk as it is very thin and will probably not be visible.
I am wondering if an illuminated reticle might have been a good idea ...
(Those Bushnell Tacticals look pretty interesting ...)