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The best long range rifle is always going to be a compromise. You just have to be sure it is your compromise.
Generally, the more muzzle energy you pack into a pellet the better it is for long range.Since pellets lose their accuracy as velocity reaches a point in the 900s or there abouts. The only way to increase energy is to use a heavier pellet. This favors larger calibers.
Sometimes tactics outweigh power. A common time limit for airgun benchrest is 20 minutes for 25 record shots. I prefer to shoot the entire match on one fill, because any time I am filling the gun is time that my condition might return and that is when I should be shooting. So that in a minimum of 25 shots. If a .30 can do that OK.
My choise is a .25 bottle gun.
If I may, I have two suggestions. First spent the extra money for .30 on a good set of wind flags. I don’t have a set and my scores suffer for it. Second start shooting your .22 at 75 now. Only experience will make you a good long range shot.
You really want good BC I feel like the .22 Beasts would be better right? 34gr in a .22 cal would trump 34gr in .25 cal on retained energy and BC. Now finding a .22 that's easily capable of that power is the problem