They are very good bases but i believe they are to big and heavy for a hunting rifle if you are jumping out of planes with your rifle get them but if not dont worry about them. Contact Glen Seekins at seekins precision he makes very good scope mounts and bases i highly reccomend his products and would get him to also supply your rings. The cost of rings and bases from him will likley be under the cost of 1 US optics base.
Here is his email address
His handle on this site is heatseekins
also his website is seekinsprecision.com