Leupold states the Leupold RM Ruger M77 34mm High Ring 120151 are for rimfire rifles. However, I have read information stating people have used them on centerfire rifles. I recommend contacting Leupold to confirm the Leupold RM Ruger M77 34mm High Ring 120151 will work with your specific rifle.
These Leupold RM Ruger M77 34mm High Rings will not work with a CZ455. These rings are specifically designed for the Ruger M77. We currently do not have a set of dovetail rings for the CZ 455 that will fit a 34mm diameter scope.
The ring height will be determined by the objective lens diameter as well as other features such as barrel diameter. The guide at the link below will help you determine what ring height you need for your scope and rifle.
https://www.opticsplanet.com/howto/how-to-how-to-measure-scope-height-scope-ring-height.html
These rings are different heights. You will need the rings at the link below for the Ruger M77/22.
https://www.opticsplanet.com/leupold-ruger-rings.html?_iv_gun-model=ruger-77-sl-22
Leupold recommends for objective lenses 56mm in diameter the extra high height rings are used.
Yes, these rings will work with any size action of M77.
Yes, these rings will mount to the receiver using the factory Ruger mounting system.
These rings will fit that rifle.
Well these fit the solid bases that are on the Ruger M77 tank safety long action built in 1976