Yonic Posted February 18, 2008 Report Share Posted February 18, 2008 Can somebody tell me why PCP's appear to give you less shots per charge in 177 when compaired to 22? You would think that it should be the other way round due to the weight incress in the size of pellet? Cheers Jon Quote Link to comment Share on other sites More sharing options...
russ91 Posted February 18, 2008 Report Share Posted February 18, 2008 i don't know mate but i get 52 shot before the shots start to drop and my rifle has a 200bar reservoir and is .22 Quote Link to comment Share on other sites More sharing options...
Yonic Posted February 18, 2008 Author Report Share Posted February 18, 2008 Just had a look at the air arms web page the S410 carbine will give you approx 80 shots in 22 but only 60 in 177? the standard version is 90-100 in 22 and only 80 in 177? I may be wrong but to acheive the same level of power for example 11ft/lbs the 177 would have to be travelling at a quicker speed, Based on this I would expect that maybe it would need more air to acheive this?Please correct me if this is wrong. Just trying to understand why this is..... Quote Link to comment Share on other sites More sharing options...
billsy Posted February 18, 2008 Report Share Posted February 18, 2008 I believe your correct. As the 177 has to travel at a higher velocity to achieve close to 12 pound it takes more air than 22. I could be wrong though! Quote Link to comment Share on other sites More sharing options...
russ91 Posted February 18, 2008 Report Share Posted February 18, 2008 :look: Quote Link to comment Share on other sites More sharing options...
pin Posted February 18, 2008 Report Share Posted February 18, 2008 It's to do with pressure. If you press your thumb against a wall you probably won't leave a mark in the wall, use the same force as before to push a drawing pin - it will easily leave a mark and most likely be driven into the wall. The force was the same, the pressure was much greater however, due to the considerably smaller area on which the force was acting. Exactly the same with .177 vs .22 PCP airguns. Remember that both move at vastly different speeds when you are considering a muzzle energy of 12lb/ft. The .22 is heavier and has more surface area than the smaller and lighter .177 pellet. The pressure required to drive a .22 round is considerably less than that needed to force the smaller .177 round (smaller barrel more air pressure) - it also has to be driven faster in order that it reach the correct velocity so it will have the same energy as the .22 pellet. More pressure = more air. Quote Link to comment Share on other sites More sharing options...
Yonic Posted February 18, 2008 Author Report Share Posted February 18, 2008 Thanks Pin, I thought it may be somehting like that. The chap in the local gun shop has been telling people that with a 177 you get more shots per fill. I did mention to him that wasn't the case at lunchtime but didn't know why. Cheers Jon Quote Link to comment Share on other sites More sharing options...
magdie Posted February 18, 2008 Report Share Posted February 18, 2008 The way it was explained to me was, that if you have two straws, one smaller in diameter than the other, it is harder to blow down the one with smaller diameter than the other one, you need more air pressure, and this is why you get less shots with a .177 than a .22 Quote Link to comment Share on other sites More sharing options...
pin Posted February 18, 2008 Report Share Posted February 18, 2008 Isn't that what I said ? Quote Link to comment Share on other sites More sharing options...
bignoel Posted February 19, 2008 Report Share Posted February 19, 2008 Hmmme very well explained good info Quote Link to comment Share on other sites More sharing options...
sternyboy Posted February 19, 2008 Report Share Posted February 19, 2008 A .177 pellet is lighter than a .22 pellet. Therefore it will need to hit harder/faster than a .22. A .177 pellet travels at around 800feet per second compared to .22 at 600 FPS so it needs more air preasure behind it to get the same power. I think thats about right but I stand to be corrected Quote Link to comment Share on other sites More sharing options...
airssassin Posted February 20, 2008 Report Share Posted February 20, 2008 I believe you are right... energy = weight x velocity therefore, if you have a lighter projectile (.177) it will need to travel much faster to have the same energy and will need more air. Because a .22 is heavier it makes the same power with a lower velocity and need less air. Quote Link to comment Share on other sites More sharing options...
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