Edgun Kryptonite? – Issue Discovered – Request Guidance
Cold temperature?
I shot my gun just a few days ago in 50 degrees F (10 C). It did just fine.
Today, I shot it at 35 degrees F (1 C). And it did horribly. 1-1.5″ at 50 yards. 6″ at 100 yards.
The gun sounded different – less powerful. And the POI was low at both distances. I’m assuming that the cold weather makes the hammer spring less “springy” and consequently, it is hitting the valve with less force and more inconsistency.
Thoughts? Experience?
Thanks,
Ted
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I gave it one more try before the sun went down. It isn’t that the pellets are spraying around. I get 3 at one POI, and then 3 shot 4″ low (100 yards).
I think this may be a cold bolt o-ring issue…. 😕
Still working on it.
I’m having the same troubles here, with my .25. It is 41 degrees here. I noticed a poi drop and just got done putting it on the Chrony. I had it set at 955, when it was warmer, today it was shooting at 935. I had to turn the hammer spring adjuster in about 3/4 turn and was at 948 when the Chrony ran out of light.
I can’t see how the hammer spring would be affected by the cold. Maybe the cold air takes longer to get moving?
It is supposed to be in the mid 60s Sun and Mon. I will see what speed it shoots then.
All air pressure conteiners acumulate humidity… just think in the dry packs of the hand pumps, so due the loewr temperatures you can have little ice cristals inside the regulator/valvle system.
These ice pieces can be microscopic size ones… try dismounting the fronrt and venting the tube.
seeyou
Mac
Hi Ted,
Sounds a bit weird to me. Lots of shooting in Norway and Sweden in sub zero (down to minus 15C) with others types of PCPs with no problem whatsoever (apart from cold fingers and feet). Will surely test my Matadors when I get them. Minus 10/15 C predicted for next week, and the Norwegian winter would often give you a lot below that come Jan/Feb…
May be the Russian EDgun forum have some reports. At least they should have the temperatures….. 😉
Cheers
Trygve 😀
Don’t know about the springs, but my condor would shoot with less power, in the cold below 32F/0C. Above 80F was alot better.
Sam 😎
I shot my gun just a few days ago in 50 degrees F (10 C). It did just fine.
Today, I shot it at 35 degrees F (1 C). And it did horribly. 1-1.5″ at 50 yards. 6″ at 100 yards.
The gun sounded different – less powerful. And the POI was low at both distances. I’m assuming that the cold weather makes the hammer spring less “springy” and consequently, it is hitting the valve with less force and more inconsistency.
Thoughts? Experience?
Thanks,
Ted
Air works by Cubic feet or cubic inces which ever, not PSI.In real cold weather try a couple hundred pounds less, you have the same volums of air just less Pressure.
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According to Chairgun, a drop from 950 fps to 930 fps with a 21.14 grs (Barracuda) pellet would result in a theoretical drop in POI of 0.104 inches (2.6 -2.8 mm) at 50 yds. Rifle zeroed at 30……
I don’t know what air temperatures Chairgun’s calculation is based on, and I don’t know how accurate the calculations are, but usually they’re quite good.
While it is true that cold air has a higher density (is heavier) than warm air, – and that a pellet would in theory travel faster in warm air than in cold, I am surprised by you finding a really noticable drop in POI going from +20 C to 0 C. I have not been able to detect any difference of importance with any of my other rifles……
Likewise, I have very much the same POI at sea level as I have at an altitude of 1500 mts where air is thinner….
My own varying POIs come from other reasons (I think)… 😉
But I could be wrong………..