This is actually a follow up to an earlier post I did on the Gamo P-23 Semi-automatic CO2 pistol. The pistol's double action semi auto mode is for BB's or round lead pellets which are loaded into a spring loaded magazine inside of the "slide" beneath the barrel.
The P-23 may also fire .177 caliber pellets as a single shot. This report covers the velocity for the following projectiles.
1. Gamo Match Pellets (these were also used as the control pellet)
2.Gamo Raptors (the much advertised high velocity pellet)
3. Gamo Huners (domed)
4. Gamo Masterpoint (field point)
5. Gamo Magnum (field point)
6. Gamo Rockets (lead pellet w/BB inset in nose)
7. Gamo Round (sphere/ball)
8. Crosman Copperhead BB's
Testing Procedures.
All shots were indoors with tempature and humidity recorded. Velocity was chronographed on my Alpha Chrony with sun-shades attached and under strong incandescent light.
The initial velocity testing used Gamo's Match Pellet (1.77 cal. 7.71 gr.) which also served in later sessions as a control pellet. Control shots were made when CO2 cartridges were changed (to elliminate any "hot shots" from a new cartridge, and before each day of shooting began in an attempt to control CO2 related variables. Single shot loading, deliberate time between shots and room temprature will help mittigate the cooling/regrigerant effect of the CO2 gas. Test with rapid fire vs single shot on the Gamo Round (balls) and Crosman BB's should demonstrate how this cooling effects velocity.
Shoots were made 3 and 1/2 feet from the muzzel to the chronys 1st skyscreen/sensor.
The P-23 may also fire .177 caliber pellets as a single shot. This report covers the velocity for the following projectiles.
1. Gamo Match Pellets (these were also used as the control pellet)
2.Gamo Raptors (the much advertised high velocity pellet)
3. Gamo Huners (domed)
4. Gamo Masterpoint (field point)
5. Gamo Magnum (field point)
6. Gamo Rockets (lead pellet w/BB inset in nose)
7. Gamo Round (sphere/ball)
8. Crosman Copperhead BB's
Testing Procedures.
All shots were indoors with tempature and humidity recorded. Velocity was chronographed on my Alpha Chrony with sun-shades attached and under strong incandescent light.
The initial velocity testing used Gamo's Match Pellet (1.77 cal. 7.71 gr.) which also served in later sessions as a control pellet. Control shots were made when CO2 cartridges were changed (to elliminate any "hot shots" from a new cartridge, and before each day of shooting began in an attempt to control CO2 related variables. Single shot loading, deliberate time between shots and room temprature will help mittigate the cooling/regrigerant effect of the CO2 gas. Test with rapid fire vs single shot on the Gamo Round (balls) and Crosman BB's should demonstrate how this cooling effects velocity.
Shoots were made 3 and 1/2 feet from the muzzel to the chronys 1st skyscreen/sensor.
We observed velocities as high as 417 fps with the Match Pellets with many hovering between 394 and 409 fps.
Please stay tuned for the additional pellet velocities and theories.
NVB
1 comment:
Question for you -- where in the Portland area... say on a Friday (like today), do you think I could pick up .20 cal Beeman FTS pellets?
Darrel, of Darrel's Airguns, is getting ready for a show and Ollie Damon's is out of them.
I know it's short notice, but I thought I'd ask. Getting caught short on pellets, and have surprise shooting time.
Bp
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