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I really like the way you all think... The trick with a really long barrel will also be accuracy as the subsonic 45ACP will be in the tube a fairly long time so recoil and the like will affect the usefullness some... The same concept could be used for other small powder charge rounds... 300 whisper with a 26-inch barrel perhaps?
It does sound like a fun project and I wonder about the old "revolver" style rifles... what if you took something like a Ruger Blackhawk with the 45ACM/45Long Colt conversion and built it into a rifle like this... A stiffer 45LC would give better distance performance while the 45ACP would be quite with the obvious noise from around the cylinder.
I wonder if anybody does conversions like that? Regardless, a T/C Contender or Encore barrel might be one of the cheapest ways to try a project like this but I guess any rifle barrel could be shortened if you later decided you didn't like it...
Good luck and sure does sound like fun!
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