Crossman 2250 valve

I put in one of the larger transfer ports and it did well with the 16” barrel I use. I pieced together my 2250 build, it’s not a factory 2250.

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the 2250 uses the same valve as the 2240
and if you creased the valve volume by length you would have to deal with the valve stem, and spring
a lighter valve spring and heavier hammer spring could do the same thing by holding the valve open that spit second more
and a boss valve could possibly do all that with just a valve replacement
you are getting in the world of R&D and all that takes is time and money
a video and his way of getting more internal valve capacity starts at 2:30