Elan cal change info needed

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I am thinking of changing my elan from .22 to .177. I know i will have to change the barrel and probe. Has anyone got any idea how many shots I will get in .177 at the moment I get 50 1n .22 at 170bar
thanks

[Snapshot.]

I'd say 35 shots. My usual rule of thumb is to multiply the number of .22 shots by 0.7 to give the number at .177.

Jonathan

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thanks snapshot