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Here's a thought, if Illusion or someone else was still up to the task of testing these barrels.
Forget the idea of swapping springs firstly.
All that is needed is a gas rifle in which you can swap barrels easily that has an external source and regulator.
Fire off 10-20 shots through a chrony at the target and record the distance the BB deviated and its speed. Extrapolate that speed to energy.
Repeat for different speeds and weights, then barrels.
It would take maybe two or three days to measure all your data, and I would be more than willing to help out if this were to be conducted in the Ottawa area, or at the very least I have enough university lab experience to properly analyze the results and report on them.
All this requires is the regulated gas receiver, a bunch of barrels, BBs, a chrony and an indoor spot to test.
This will provide hard data for extrapolation to what springs can be used in what lengths of twist barrels to achieve the optimal grouping and the roll-off rate for those that want a bit more BB velocity.
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