I hear what you are saying, and I don't think each setting would be optimal under what I described. But with variances in pellet weights and barrel length, I think it will be plausible.
ex. 250mm .22 barrel with 18.1 gr pellet
350mm .25 barrel with 33.95 gr pellet
450mm .30 barrel with 44.75 gr pellet
My understanding is .22 recommended jets are .4 + .5 =.9
.25 is something like .4 +.3 =.7
.30 is .2 + .2 = .4
I'm not an expert, so someone with more knowledge please correct me, but it seems like if you went for something like .7 jets and could adjust the reg you could determine how to get the same fps from all three calibers with different reg settings. It wouldn't be the most efficient at .22 or .30 but it would at .25. Getting similar FPS at all three calibers you would be able to swap out, have the different FPE at the same FPS without degassing and changing the jets. I also wonder if you got the FPS close at each caliber if you would even need to make scope setting changes.
Dwell time in this case is just volume of air correct? So to get the .30 at 850 fps with .7 jets you would need a higher reg setting than if the jets were set at .4, which is less efficient, but I don't think by a lot. I think this would also be counteracted some by getting higher fps for the longer barrel as you go up in caliber.
Then again, I could just be farting in the wind here. I haven't received my .25 350 mm barrel kit yet so I can't test this, but I've done a lot of testing with a lot of jets with my 250mm .22 cal and reg settings. Reg changes make a much larger difference in both fps and air consumption than jet changes. Jets seem like they are fine-tuning for efficiency at a specific caliber.
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They can be 3d printed though if you have a printer.
