I have a TSOB mount on my FA83 .454 Casull and has never moved from day 1 (3 years and 400-425 rounds ) all Hornady and Buffalo Bore factory ammo.
Not sure about the Ruger, but I'm sure SSK knows what they're doing when designing their mounts to specific models. Give SSK a call, they will help you make it right.
Flattop