An advantage to the double is that it's not fussy about cartridge length or size so in designing a cartridge for it you can use a big case and there's simply no need for high pressures.

The bolt rifle has constraints on the case size and requires high pressures to get the job done.

As for blow ups, it's a case of when they go, they do as they damn well please. More seriously, when they blow out through the action it's usually the case or primer that fails first. In other words too much pressure for the case. If they go out through the side, its too much pressure for the barrel. Of course the action may be poorly desigend or have a flaw. But a double action is not inherently weak. With a primer or case failure a modern bolt rifle may handle the escaping gas better.

Bottom line is save the over pressure experiments for your Ruger blackhawk, get an old tire, a long string, a big tree and ear muffs.