Pennsylvania Game News - July 2017 - 55
ates a recoiling vibration.
Early spring air guns were difficult to
shoot accurately, due to spring-release
motion. Unless scopes were well secured,
they tended to walk off their mounting
rail. Spring vibrations also wrecked the
innards of even the best scopes.
Now, many spring-piston air guns have
a double-opposable-spring system that
eliminates vibration and doesn't bother
etched-reticle scopes. But these guns still
have a certain level of recoiling vibration,
which takes time and practice to master.
You also will find a slight variance in
velocity when shooting in extreme cold
and hot weather.
In addition, don't keep a spring gun
at full cock in storage. It will weaken
the spring, robbing you of power and
Gas-piston-driven rifles look and
operate like spring guns. But they use
an internal compressed-gas cylinder that
achieves further compression when the
rifle is cocked.
Compared to a spring air gun, a gaspiston gun shows improved reliability in
varying weather conditions and greater
durability if left cocked for prolonged
Gas-piston guns also have faster
lock times and lighter vibrations, which
Typically, gas-piston guns last longer
that other air guns and remain more consistent over time. The down side is they're
more expensive than the spring-driven
guns, and if the gas cylinder develops a
leak - which is rare - it needs to be sent
back to the factory for repair.
The pre-charged-pneumatic air-rifle
is the Cadillac of hunting air guns. It
contains an air chamber that is filled by
an external source - a hand-pump or commercially filled air tank - and can hold
2,000 to 4,500 psi for each charge.
A standard home-use air compressor,
which usually can deliver air only at a
couple hundred psi, cannot be used to fill
a pre-charged gun's air-chamber.
Charging frequency and the number of
shots per charge - 20 to 70 - varies based
on the rifle's caliber and velocity.
The main advantage of a pre-charged