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Discussion in 'Anything Airgun Related' started by Deker, Jan 3, 2009.

  1. Deker

    Deker Active Member

    Likes Received:
    Hi All

    I could do with some help here...been having a debate on another site about power etc........Statements have been made saying a Heavier pellet produces more power in a PCP and a Lighter Pellet produces more power in a springer.

    Now, this is being touted around as fact because "my mate tried it".. "heard it from someone"..."everyone knows it"..."works in my guns".."my dealer told me".......I am simply looking for a provable, demonstrable, scientific explanation, the above statements are totally unscientific and these apparent results could have been produced by a mass of anomalies!

    IF this is correct there must be some sort of fundamental difference in the way springers and PCP's deliver their power in relation to pellet weight!

    I don't understand this, it doesn't make any sense to me, and I am yet to be convinced.

    Anyone got any answers....not..."my mate tried it".. "heard it from someone"..."everyone knows it"..."works in my guns".....


  2. Stream

    Stream Member

    Likes Received:
    My understanding is that the Springer uses less air than a PCP and that the pellet reaches close to full velocity in the first few inches of the barrel, and then is approximately maintained at this velocity until it leaves the barrel. Lighter pellets are easier to accelerate and therefore are more responsive to the initial push.

    PCPs tend to push more steadily reaching full velocity as the pellet leaves the barrel, this tends to favour a heavier pellet.

    I suppose there is some evidence of this in that for a given power, you can get a springer carbine with a very short barrel (although it will benefit from a silencer due to increased muzzle blast), the long barrelled version wouldn`t need a silencer as less air is lost out of the barrel (ie the long barrel acts as a silencer and therefore could be more efficient at propelling the pellet)

    PCP guns tend to have long barrels even on carbines and tend to use silencers as well as there is a noticable muzzle blast. (ie more air used)

    However in practice it depends on the pellet/gun combination and that is probably down to fit etc. I have only tested a few pellets in my Springer and i believe it is generally true that springers like light pellets but there are plenty of anomalies.
  3. David

    David Engaging Member

    Likes Received:
    Trowbridge wiltshire
    A good site to go on for understanding springer's is.........


    Not a bad site for understanding air rifles, it has demos and interactions including the difference between lighter and heavier pellets, Im sure its been mentioned on this forum before

    It personal preference for myself, but I prefer springer's over pcps for the simple fact springer's are cheaper to buy and require less equipment and never require refilling.

    The big difference with both is recoil, both types of gun are relatively good at sending a pellet downrange but it is an art in itself to fire an air rifle that has recoil,

    Power of a pellet as it leaves the gun has various factors to consider but in general .22 has a slower velocity and has more of a trajectory and requires the shooter to deliver an accurate shot over a longer distance , its kill zone would remain between 25 - 40 yards though

    .177 cal pellets are ideal for target practice, having a faster velocity and flatter trajectory less effort is needed for a direct hit down range. For hunting you would target the head of your quarry at about 20 to 35 yards, although you can kill at further ranges I would recommend sticking to a closer kill zone

    In terms of target practice both pcp and spring power is alright, but if you want to go hunting pcp is best, its quieter with practically no recoil and a lot fairer on you quarry
  4. Darren Petts

    Darren Petts Temporarily Alive

    Likes Received:
    Piston guns run at around 18000 psi using very little air. PCPs run at around 3000 psi and use vastly more air (hence the noise). This is the fundamental reason. The inertia of a heavy pellet robs a small volume of air of it's effect hence a piston powered gun's preference for light pellets. The large volume of a pcp can easily overcome the heavy pellets inertia and accelerate it almost as well as a light pellet so will make more power with the heavy projectile.

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