What one can do with CVA rifle is back out the firing pin bushing until the primer is held snugly, or with a slight 'crush', when the action is snapped shut. What i do is measure the primer before i close the action on it, and then afterward. My goal is to see about 0.005" or so crush of the primer. Myself, i use shims under the firing pin bushing until the desired result is achieved.
The advantage is there will be zero blow by. The advantage is all the heat from the primer reaches the powder. The advantage is the bottom of the scope won't be singed.