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I dont know if this thing has an inner/outer barrel, but keeping it simple and make one barrel would be more simple.
if you look at real steel, the .17HMR caliber is pretty much the same as a .177 pellet gun. rifling shouldnt be an issue.
getting the proper fps so the projectile can be stable and yet under the limits is going to be hard.
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"Lieutenant John Chard: The army doesn't like more than one disaster in a day.
Bromhead: Looks bad in the newspapers and upsets civilians at their breakfast." - ZULU (1964)
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