I BELIEVE the internal VOLUMN is going to be the most important ,more than the pressure...the bigger the can the more room the hot exploding gases have to do their thing,thus why the bigger cans are the quietest.... gunworks do a skinnier version of the spartan..MAYBE you could get a slightly longer one and be good to go.
the magnum rated cans are large...the .223 sort not so much..your .308 will be burning much more powder so SHOULD need more room to put gases....it will always be louder as the hole in the end is bigger so more noise will escape...I have theory that a layer of insulation tape helps no end in reducing that first shots noise.comparing rimfire can to centrefire can the rimfire is less than half the size so it follows its only got half the room for gases.
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