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Blanket statements about the strength of actions is just foolishness as is looking only at the size of the bolts and locking lugs of bolt actions. What difference does it make if the locking lugs and bolt are super strong if the receiver that they lock into is weak. The Ruger is a rear locking lug action so we must ask how strong is the receiver in front of the bolt lugs, we must ask how ridgid is that action, and does it have any shapes or edges that make it prone to stress risers? In a front locking lug action, the lugs engage the generally immensely strong receiver ring that the barrel threads into and the strength of the action behind that point is rather inconscequential.
The fact that the O.P. Is concerned about whether the 77/22 is stronger than a Marlin levergun tells me that he is considering pushing the envelope on 44 magnum power levels. After all, a Marlin is strong enough for any factory or saami approved handloads.
As several others here have already stated, the Rugers strength at this point is still an unknown. I am quite sure it is strong enough for any factory or saami approved load, but would be hesitant to shoot hotrodded loads in it or the Marlin.
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