Suppressor(s): Existing atmosphere can change accuracy in a rifle?

[islandermyk]

So I took out the GAP and the new SDN6 can.




Did a 5 shot group cold bore without the can. It was fine and dandy. (Top left)
Okay.. now with the SDN6 on. (Top right) First shot dang near dead on. Second shot was right below it. Third one another inch below it. I was shooting pretty fast strings, but when I saw where that third one hit I pretty much freaked out and stopped for a minute or two. So I then shot the fourth one and got it dead nuts again (right beside the first shot) and the fifth one is on the left of the second shot.

Seeing that first group shot with the can on made me wonder....
Note the middle target. That one was with the can, but this time with a different shooting strategy.
After every shot in this 5 shot group I left the bolt open for little more than 3 seconds ejecting the spent cartridge.

So do you think the existing atmosphere from residual pressure in the can after a shot can cause a spread in groups?

By the way, I love this SDN6... been smacking steel at 1000 yards and everything inside that. It really shines from 800 and inside of that... and the rounds were hand loaded 175 gr SMKHPBT 43.7 gr Varget