Suppressors SD's and suppressors

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I sometimes get lucky with a low SD(4.6) with the Ultra 7. Granted its only 5 shots.
 
My first shot seems to run faster then the rest of the string. Take it out and I'm single digits. I've tested several times. It just seems like once the can heats up things stabilize . Gonna test again without the can but wondered if this was a common dynamic with cans.