Please email us at techsales@opticsplanet.com so we can further answer your question.
Please email us at techsales@opticsplanet.com so we can further answer your question and get you the correct parts.
In regards to height, it really depends on the outer diameter of the objective lens. I would highly recommend going with medium height rings, as the difference in height will be about .1" and that will make a difference in mounting and should not affect zeroing. Savage bases are normally compatible across the board as long as they are meant for the same type of receiver (round back vs flat back) and are two piece bases. If you have specific questions please email us at techsales@opticsplanet.com and we can help find the appropriate mounts.
They are round front and back.
Unfortunately Leupold does not make any 2-piece bases for your rifle, nor do they make and dual dovetail mounts for it. They make one of their windage adjustable one-piece bases for it here: https://www.opticsplanet.com/leupold-std-1pc-1-piece-bases.html?_iv_gun-model=remington-7400-sl-7600 and a one piece QD base for it here: https://www.opticsplanet.com/leupold-qr-quick-release-bases.html?_iv_gun-model=remington-7400-sl-7600
Here is a link to this page filtered to show only the models compatible with your Winchester 70:
https://www.opticsplanet.com/leupold-duel-dovetail-dd-2pc-2-piece-bases.html?_iv_gun-model=winchester-70
Leupold lists MPN: 54218 as compatible with the Thompson Center Triumph.
Unfortunately Leupold does not make any bases for your Mossberg 464. Mossberg lists that your firearm is drilled and tapped for Weaver #403 bases.
Leupold lists MPN: MPN: 114975 as compatible for the Thompson Center Compass rifle.
MPN: 50042 will work.