2240 Myth Busted

[dogmansam]

This not a crosman test, it is a conditions test so posted here.

Testing my 2240 configured:
UTG R/G dot sight,
Std barrel 7.5 in,
Steel breech,
B&A Boss valve,
6.5 in TKO,
12 gm CO2,
Pistol configuration,
Normally shoot 25 shots from cartridge, 20 solid strong shots.

Conditions:
25 degrees outside back yard range,
Distance to target 13 yards,
2 2in orange target spots on 8.5 x 11 computer paper,
Shooting off hand, no stock, no stick,
Time between shots 5-10 seconds,
Shoot till CO2 runs dry.

I see all the discussion about the fact that CO2 does not work in cold weather.  I am 68 yrs old and learned, “don’t believe anything you hear” and only “half of what you see”.  I spent my 45 yr career in computer software development, and one can only proof something by testing.  One sets out parameters for expected results, then test to expected results.

It is cold snow on the ground, sunny conditions, but my shooting spot is in the shade.  Air temp approximately 25 degrees.  Going to shoot 5-10 seconds intervals first 12 shots.  Rest 2 minutes then shoot dot #2.  12 more shots 5-10 seconds into dot number 2.  I am not that good of a shot, so be it --- I either hit the 2in dots with the 24 shots, either on the dot or a little high.

Results:
First 12 shots on dot or a little high,
Second 12 shots on dot or a little high,
Run CO2 dry:   shot 26-30 on the 2nd dot still on the dot, shot 30-35 mostly on the target mostly on dot,  shots fell 3in off for shot 36-38.

I expected a big drop off after 12 shots from the cartridge. Expected minimal rest time between shots, valve should either freeze or no power.

I THROW THE 15 YARD BS FLAG.  I either have the worlds best 2240, or most of what I have read from all the experts that have not actually shot in cold weather, huge giant BS !!!!!!!!

I intend to do more test over the next week if I can squeeze it in.  Will do Ivory soap penetration test.  Put shoulder stock back on, and shoot off the stick.

I will publish results as I get them.  Going on 2 week vacation next week, so test might not get done right away.  Expect to do several test different condition.  Have to set it up and write down a test plan with expected results.

Please guys weigh in on this, what do you gave to say? ?

[PakProtector]

Assure time for gun to cold soak. Use a chrony, all the other stuff is dependant on velocity, so why not start measuring there. Measure also before cold soak.
cheers,
Douglas

[robert w]

sometimes the experts are wrong . you know what an expert is dont you ? its a drip under extreme pressure

[Bullit]

Yes, as Douglas says.  Leave the gun out and the Co2, to get it cold.   Then chrony it and compare it to indoor temps when it's all warmed back up.
I speak from experience with a Hammerli 850 that it does suffer in the cold...unfortunately.

[dogmansam]

What am I trying to prove.

Actually I am trying to prove something to myself, and just trying to share with others.  My guns are a mixture of CO2 or pumpers, no rifles, no springers, or PCP.  Just a simple guy trying to have some fun.  I don’t hunt with AG’s because I can’t really get out and hunt because of limited mobility the last few years.  (Did down  two Canadian geese (12 ga semi auto) a couple of weeks ago that dropped into our decoy spread, but not the story here.)

Since winter set in I have been shooting my mod 1377 and my mod 1322, all the goodies and dressed up as carbines. Been trying to shoot 50 shots a day most weather, just to keep a hand in.  I am not shooting for any competition, only with myself always trying to improve. 

John – you made my point very succinctly, 2240 sighted in during 70 degree weather same shooting range and distance.  At 25 degrees I expected it to shoot at least a foot low at least according to a lot of shooters.  And yes I hobble out into the backyard using my walker, 2 inches of snow this morning, just looking for some 2240 love; but it could have been any of my CO2 pistols, or CCS2400kt.  Oh no chrony don’t want one don’t need one.  I just punch holes in paper don’t need a super wiz bang 1200 fps hotrod  to do that.  Heck I even shoot BB pistols, what a dweeb.

I spent my whole life in science environments so yes I do understand cold and  CO2.  By the way I live in Colorado where it can be 25 in the morning, and 60 by 2 PM, so the need for dry ice doesn’t foot the bill just not needed.  Allows me to run more test in a lot of temperature environments, which is what I plan on doing. (DO NOT adjust the dot sight)

OK my real point.  I frequently see on forums, not just here, where some noob wants to buy a 2240 or something CO2 and do some plinking.  Experts jump in “oh you shouldn’t do that no good in cold weather  blah, blah, blah”.  I say baloney just buy your CO2 gun to plink with and have some fun. Other than the experts, who gives a rats whiskers?

[rsterne]

Whatever you're happy with.... it probably doesn't take more than 200 fps to punch holes in paper anyway.... I just did a quick check on ChairGun.... A typical 2240 shoots about 460 fps at 70*F.... If you drop that by 100 fps in the cold, your POI at 13 yards drops by about an inch (half the size of your targets).... However, your 2240 is FAR from stock.... so who knows....

I have a 1750 that shoots harder at 46*F than at 75*F.... Why?.... because I tuned it to be very frugal on CO2, and the valve is self-regulating over the range of pressures found between 35*F and 75*F....

I'm glad you're happy with your 2240 in cold weather.... but do me a favour and don't assume others don't know what they're talking about.... You tested ONE gun, and not a stock one at that.... You may very well have it tuned to be somewhat self-regulating.... or maybe a 1" difference in POI isn't noticable the way you were shooting....

Bob