When we reviewed the SIG SAUER P320 CO2 air pistol recently, we were a little disappointed at the Muzzle Velocity achieved in the test. And so, it’s fair to say, was SIG SAUER.
The manufacturer claims “up to 430 FPS”. In the HAM test, we actually achieved an average of 347 FPS for a 10-shot string.
Now, Muzzle Velocity is not a very important factor for firearms replica air pistols like the SIG SAUER P320 CO2 air pistol. It’s not weighted highly in our test review scoring and around 350 FPS is actually plenty when shooting pellets, as this gun does.
But the question remains, why did the HAM test give FPS figures that were so far below that claimed by the manufacturer?
As it happens, I traveled to the SIG SAUER headquarters in New Hampshire recently and I took the SIG SAUER P320 CO2 air pistol we tested with me. (There will be a separate story about the visit in HAM quite soon). This gave us the opportunity for SIG specialists to inspect the pistol and for us to sit down together and understand what might have caused the difference.
What we found can be summarized as:
1. Differences in the pellet weighs used.
2. A minor issue with the gun itself.
3. Temperature difference in test environment.
If these factors are all taken into account, HAM’s calculations are that the SIG SAUER P320 CO2 air pistol tested by HAM will achieve the claimed 430 FPS Muzzle Velocity at a temperature of 88 degrees F, as follows:
347 FPS – HAM Test Muzzle Velocity
+ 20 FPS – Due to different pellets
+ 18 FPS – Due to minor valve issue
+ 1.7 FPS Per degree Fahrenheit due to test temperature effect
= 430 FPS – Manufacturer’s claimed Muzzle Velocity would be achieved at 88 degrees …read more