Reply To: Marauder .22 barrel

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JohnL57
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I don’t have a lot of info on ideal FPS for you, you’ll have to figure out what works best for your gun. My .22 Marauder has been detuned to around 22 ft.lbs. It shoots the JSB 18.1s very accurately at about 750 FPS. It came that way from previous owner and I am leery of messing with a good shooting gun so it will stay that way! A well tuned gun should climb a bit in velocity to a peak and decline form there, ideally with not too extreme of a difference (say 20-25 FPS) from low to high. The longer the distance you are shooting, the more critical the spread in velocity will become. Here’s a video on tearing down a Gen 1 Marauder, the presenter explains a bit about what the different adjustments affect.
https://www.youtube.com/watch?v=kCqPYmHG048