Hi all
Decided to take secretagentmole's advice and took a couple of air rifles along with my 7lt cylinder to the outdoor range yesterday. Both air rifles needed filling as both down into the yellow from last shoot.
The range is 35-45 minutes away. Once I got there got the rifles and cylinder out of the boot and onto the range stand. I filled the first rifle (HW100 KT) to max pressure and shot it down to its usual level before refilling whilst doing a shot count. I was down by one mag when compared to summertime. Admittedly the gun was in the boot of the car on the way over so it and the cylinder could have been warmer than I expected when filled.
I turned to the second rifle (Daystate Wolverine C) which had now been in the outdoor range area for about 2-2 & half hours and filled from the cylinder to max pressure. Again shot the rifle down to the usual level for refilling doing a shot count. I was down 1 mag on summertime amounts. I may have been able to squeeze anothr mag out of the rifle but it was touching the yellow and don't want to tempt fate
So it looks like there is a slight difference when filling at the range rather than at home, but for me it is negligible. Think I will be taking the cylinder with me to fill the rifles in this weather through as the upshot was being able to use the HW100 more
One other thing I noticed was whe the weather was misty / foggy in the morning compared to the sunshine in the afternoon (in the mendips the weather can change within minutes ) the mil dot adjustment change by at least half a mil dot. So looks like the weather you are shooting in can make a difference to your aiming point as well.
Cheers
Ross
That will be due to the greater contraction of the piston seal as compared to cylinder wall, giving a slightly slacker fit and, hence, faster piston acceleration.
If the spring was caked in too much grease, the greater viscosity of the grease when cold might balance out the above, but I wouldn't advise this.
Jim has written some excellent articles on this very subject in his Technical Airgun series.
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This is what I have noticed at the outdooe range. Any other time of the year I need to give 1.5 mildot @ 50 yards with my KT 100, JSB 4.52, MTC EVX 4X16 F1. Since the turn of the weather I need 2 mildots. The gun is consistent around 11.4 ft.lbs so the extra 1/2 mildot must be due to the increase of the density of air in the colder climate. This means that the BC value of the pellet has gone down from 0.022 to about 0.017 with the subsequent loss of energy.
A.G
Happy Shooting!! Paul.
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