I did the calculations, I'm not sure if they are right, math is NOT my subject. I want to make sure my rations are right before I build my gun.

I'm using a 2.5" barrel that is 60" long

I'm using a 4" barrel that is 42" long

I got 1.7:1 as an answer. Is it correct? and is this good ratio for a pneumatic. please do not rag on me saying use search, I did. I'm no good at math.

Thank you

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