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All Springer/NP/PCP Air Gun Discussion General > "Bob and Lloyds Workshop"

950 fps - The Magic Number

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rsterne:
Just a few thoughts based on my experience and measurements....

1. As you push velocities into the transonic region (over Mach 0.8-0.85 ie 900-950 fps) accuracy often suffers due to buffeting....

2. As you push velocities into the transonic region the Ballistics Coefficient (and hence the wind drift) suffers....

3. At a velocity of 950 fps, the FPE is double the pellet weight.... Unimportant, but it makes for an easy calculation....

I use 950 fps as my "speed limit".... If the gun is capable of exceeding that, I change to a heavier pellet.... and ultimately a larger caliber....

Bob

Tpatner412:
Great info Bob. Helpful and informative as always

Rescue912:
Awesome, great info ...

amb5500c:
Great information that's broken down into language most us can understand. And kind of "rule of thumb"ish.
Richard

CharlieDaTuna:
I agree Bob that 950 is the best all around number for velocity and anytime I did a tune, I hated to see anything above that knowing that as it broke in that it may gain 10-20 fps.

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