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The safe pressure for coke bottles is about 80 psi, which is not very high, which means low power.
Also coke bottle are not meant to withold constant change in pressure. This weakens the plastic, long story cut short, one day say byebye to your hearing, fingers or eyes.
And the moral of the story it coke bottles are good for holding coke not pressurized air.
A word of wisdom, Always do your research when making something potentialy lethal. Remember homemade guns can be more dangerous then the real thing, because the real thing will most likely not explode in your hands. :)
P.S. sorry for my poor english
80 psi = 5.51580583 bar
P.S. Your english is fine.