FPS envelope for .177 diabolo pellet.

My Avenger shoots FX 25.4 grain pellets accurately at up to 35 yards at 930 fps muzzle velocity. But I'm not sure it does well at longer range. It has not the few times I've tried it. My other guns are set up to shoot at 800-900 fps. I think that is the generally suggested speed range. I have seen reports that well under 900 shoots better in windy conditions. I think it was in Hard Air I saw a piece that said 900 fps is the best velocity for slugs to minimize wind drift. That was lower than some people seem to want to push them.
 
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Each gun is going to be different, and the weight of the pellet is also going to be a significant factor, not to mention the brand, style and a dozen other factors. Given that you are asking about 177 and assuming that you are looking to start with a medium weight pellet (8-10.5 gn) you could probably start with a velocity of 850-900 FPS and then go from there.
 
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