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BB weight for field play.


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Old September 30th, 2011, 15:09   #16
Join Date: Sep 2006
Location: Mississauga, Ontario
Mmmmm, that KWA you have will shoot beautifully with .28's while using the stock spring I gave you. This will put it at around 385fps with .2's and just over 300fps with the .28's. I miss that Rifle.....
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Old September 30th, 2011, 15:18   #17
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Join Date: Mar 2002
Location: Spruce Grove, AB
Originally Posted by L473ncy View Post
The heavier the BB going through a gas gun the more energy it picks up while in the barrel due to more energy transfer from the gas used to propel it. A spring is relatively linear in energy when you use heavier rounds but it's my understanding that with gas guns the energy "curve" by using heavier BB's is more akin to the equation "n log n".
Thanks for the explanation, much obliged.
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Old September 30th, 2011, 15:52   #18
Brian McIlmoyle
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Join Date: Apr 2005
Location: Toronto
My 400 FPS with .20 GBBR shoots at 370fps with .30

There is far more Muzzle energy with .30 than with .20 out of the same GBBR due to the gas volume not being a fixed amount. Heavier BB stays in the barrel longer and so the valves remain open longer = more gas = higher muzzle energy.
( and also a marginally slower cyclic rate)

This is not the case with AEG, Muzzle energy is a constant because the volume of air propelling the bb is fixed by the cylinder volume.

My field gun is a GBBR that shoots just under 500 with .20 .. it shoots 440 with .30 it will break dry sticks as big as my finger. bushes are invisible to it.
and if it hits you.. you feel it
Brian McIlmoyle
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