Anyone else experience this while shooting suppressed?

[No2sc2]

When I shoot my ar with 223 can I get blow back .When I shoot ar with 30 cal can I get no blow back.

I think it has alot to do with ventilation. I believe with the correct caliber, thers little to no vent vs subcaliber where theres some space for crap to escape.

 

[sovietak474u]

I get no blowback with my p9s or my scorpion. It's horrid with the beretta 92 though. Try fiocchi 158gr. Very little blowback from those.