Please reach out to the manufacture for the answer to this question.
The total mounting space is 5.96" according to Leupold. This is the space between the start of the objective lens housing and the magnification ring. The front mounting space is 2.25" and the rear mounting space is 2.48".
Yes, the Leupold VX-3HD 4.5-14x40mm Rifle Scope is capable of being used to shoot 600 yards. Shooting that distance consistently and accurately will also depend on a lot of other factors though such as rifle set up, ammunition, environmental conditions, and the shooter. If the user takes factors like those into account and does their part, this Leupold VX-3HD 4.5-14x40mm Rifle Scope is capable of shooting 600 yards.
It comes down to a lot of personal preference but I like using the Leupold VX-3HD 4.5-14x40mm Rifle Scope Boone and Crockett reticle.
The Leupold VX-3HD 4.5-14x40mm Rifle Scope has an ocluar lens focus capability.
Please contact us at techsales@opticsplanet.com for further assistance.
Please contact us at techsales@opticsplanet.com for further assistance.