The one thing I would add to Roy Hebbes post above is the additional factor of the steel which was used to make the action. Take a poor, or weak, or marginal design that might otherwise last for hundreds or thousands of shots before wearing out or becoming loose using the correct conventional ammunition... and make some of those same actions with a batch of steel that contains slag inclusions, porosity, contaminants, or slightly incorrect alloy... and now you've added the straw that broke the camel's back. Even today, with state of the art metallurgical labs, flawed or out of spec batches of steel sometimes make it out the door and get to the customer. That's one reason why some brand-new, unfinished barrels fail initial proofing. Experts say bad steel is the reason the Titanic went to the bottom of the ocean instead of limping into New York harbor with a big dent in it's side.
