How about a tapered throat?
Ala' the Ruger Mini-30 and Ruger Model 77 chambered in 7.62x39? They start out at .311-.312 at the chamber end, and wind up at .308 when the bullet leaves the muzzle. Freebore's nothing new, Roy Weatherby kept his pressures sane on the super Weatherby Magnums that way. I've been thinking of a shorty Turk chambered for the 7.62x39, too, using either the Brownell's or Numrich Large Ring barrels, threaded down to the Turkish 98's small shank and freebored a smidgen.
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"Bother", said Pooh, as he chambered another round...
Neural Misfires
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