Chrono it. No better way to check out power. Yes,air seal is a large factor. Assuming it has a good seal on an M110 it should be around the 340-350 mark,m100 320-330,m90 290-300 and m80 270-280.
Yea, I don't have one and don't have the cash for yet at the moment. I'll just have to take it to skirmish and hope it isn't over