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Old October 15th, 2014, 11:57   #2
ThunderCactus
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Join Date: Feb 2007
You always want to be on the minimum side of the cylinder. Heavier ammo will need more air volume than the .20s they test cylinders with.
And a 120 spring will get you closest and potentially just a bit over 400.
You can add or lose 5-15fps by adding or removing the bearings on the spring guide and behind the piston head
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