My M24 shoots the equivalent of 445fps when I'm using .43g BBs (1.83j) and it gets 400ft of range.
Especially when dealing with bolt actions, what you shoots on a .20g BB is completely useless information
Because you could be shooting some entirely different muzzle energy on the weight you'll be using.
For example: my M24 only shoots under 1.5j on .20s
So buy the gun, get whatever spring, chrono on the BB weight that you'll be using, and alter your setup based on that information.
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