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I've picked up .380 fired in 9mm, 9mm fired in .40, .303 Savage in .303 British, .308 in .30-06. If the extractor holds the case back against the breech face, the round will fire.
308 in 7.5x55. Heard stories of people mixing 308 in 7.5x55 rifles and wanted to test it out.
Can fire, but 308 case is thinner. Had to add thick grease around case web to make it case stick enough to center primer in chamber and ignite.
Accuracy was good and within 2 inch of GP11 point of impact. Do not recommend doing it for the average shooter.
I used factory 308 to lessen chance of case separation with reloads.