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PostPosted: Thu Aug 18, 2016 4:58 am 
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Joined: Sun Jan 09, 2011 8:07 am
Posts: 3320
Location: Central West River Nova Scotia
I just finished looking up the difference in atmospheric pressure. The widest reccorded spread is from 12.6 psi to 15.6 psi. OK, so what ? Well if you ramp that up to the avg shooting pressure of a pcp, then shooting on a low pressure day, verses a high pressure day, could mean roughly 200 psi difference, when the pressurized air hits the ambient air. That difference at 50 or 100 yds could mean a different poi . Im no expert, but I think it also would affect a springer. Maybe even more so. Low pressure air contains more moisture. So when a springer is fired, the heat generated instantly turns the moist air into steam, which expands more than dry air. This could explain why all guns shoot differentl from one day to the next. As I said. I'm no expert, and could be just blowing hot air.

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PostPosted: Thu Aug 18, 2016 8:51 am 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8989
Location: Coalmont BC
Anything with a gauge in it will not be affected if you fill it to the same pressure.... for example PCPs or MSPs with a gauge like my Millenium Pumper.... or even Steve in NC's 392 ACPs using his calibrated rebounding pump arm pressure sensor.... There will be a slight change in the trajectory with any projectile, however, as thinner air offers less resistance.... just as there is today at high altitude.... pellets slow less on the way to target....

That extreme low pressure will be in the eye of a Hurricane, so you are not likely to be shooting anyway....

Bob

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