GT,
I still owe you some 32 caliber lead bullets to slug your barrels with. Let me know your mailing address via my private posting and I'll get them off in the next day or two.
A longer barrel is heavier, hence more impulse is required to operate the action. This is offset by the fact that a longer barrel produces more velocity, hence more impulse, but generally the weight wins out and long barrels require stiffer loads. Going to a pencil barrel reduces the weight. One of the problems here is that a 22 will produce less impulse unless it can be driven at really high velocity.
I've looked at some 22/308 sabots and wondered... Will a sabot grip the bullet well enough to go through the feed cycle? At the very best, a saboted bullet will be no more accurate than a full sized bullet in the same barrel. However it might be worth trying as a proof of concept before you start messing with custom barrels and cleaning out all your mad money.
I'll sit down this weekend and run some numbers on paper to see what I come up with. There isn't much in the way of a similar cartridge to get a feel for pressure versus performance.
My idea of such a gun would be a barrel length of five to eight inches and adjustable sights.
(And I don't have my wadcutter Luger set up yet!)
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