Going from warm to cold weather affecting accuracy on condor
Im new to this but I sighted it indoors for 36 yards. Went hunting for the first 2 shots it shot great after about an hour the gun was steadily missing. So I set up a target and sure enough at 20 yards it was off. With the gun still cold. Its about 20 degrees here without the wind chill. Let it warm up again shot where it was suppose to. Any comments Y?
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I work at a company that does all kinds of testing and hydroes tanks and I learned to do this from a gentleman that has been doing this for 30 years with no ill effects.
My SCBA tank filled to 5000 at the dive shop the other day before their automatic shutoff kicked in. The dive shop owner said it was due to the cold air. I just give my tanks an hour in what ever climate I’m shooting in and check the pressure before shooting the 1st time.
A good rule of thumb to go by>>> Your pressure will drop 1.9% for every 10 degrees F. loss.
Example, if you fill your tank to 3000psi with a gas temp of 90F then set your tank outside for the night where the temp drops to 50F, the end result will be a tank with 2772psi. (apprx.)
OK, before things get silly, please understand that nitrogen is a gas that is subject to the same physics as any other gas…including air which is mostly nitrogen.
A given pressure of Nitrogen in a sealed ridgid container will reduce with lowered temperature just like any other gas.
You may get confused if you fill from a large volume N2 tank and don’t go so fast as to raise the temp of your Talon/Condor tank and then compare the results to filling with air directly from a comressor that has just got the air hot. Don’t be. Fill your tank with hot air or hot nitrogen or hot helium or hot argon and when it cools the pressure will be lower.
Oh, yes, nitrogen is going to have little to no moisture present…that does not change gas laws though.
When I fill my scba tank. I actually fill it then stick it in the freezer -32 then after an hour or so top it off. I get about 5000 psi in my scba when it is full. I know I know fuller than it should be.
I work at a company that does all kinds of testing and hydroes tanks and I learned to do this from a gentleman that has been doing this for 30 years with no ill effects.
air temp does change pressure. if u want to keep a constent pressure in the tank run nitrogen there is no moisture in it works better too .i cool my guntank to outside temp befor charging and keep it cool befor and while im shooting
Believe it or not and if not read some on long distance target shooting and you will find that temperature change chauses poi shift due to there being more drag against the bullet at lower temperatues . The lighter the bullet the more it is effected . Hunters do not see it as easly as target shooters . During the summer a 12 – 15 degree rise in temperature at 65 yards with my condor useing cph 10.5 pellets at 1000 fps I get about 1 inch poi shift . Hope it helps . There is a lot of info on the net if you care to look it up . Try long range rim fire target shooting .Marvin
I use a 6000psi nitrogen tank to fill my guns. Vertually uneffected by temp change and no moisture. Very stable vs compressed air.
They fill my tank to 3400psi most of the time so really I’ll be nervous pushing it even further but might just want to do that.
i did that with a scuba tank but it was about 32 out side but if i remember i got about 300 pounds more when the tank warmed up. the thing to do would be stick your scuba in the freezer in the summer. but the dive shop might start wondering what the hell you are doing when you bring in a frozen tank in the summer. accually i refill propane tanks, 1 lb. and i have a 5 lb. and i stick them in the freezer and hook them up to a warm 20lb tank (upside down) and fill them up it is amazing the pressure diffrental.
I believe the cold weather does affect the air in the tank causing it to shoot bad. The cold makes the air contract causing you to have less pressure in the tank. Like the air of tires on a car. Heres the question I would like to know. Does it matter if you go fill up the scuba tank when you left the tank out all night below 20 degrees? I let the thing get warmed up for couple hours before never took the chance.
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Def appreciated.