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Probably the best known "squeeze bore" sporting rifles were those made in Germany in the 1930's by Halbe & Gerlich (who combined their names into "Halger" which they used as a trade name for a high velocity rifle. The idea was to make the inside diameter of the barrel tapered so that the pressure increased as the bullet was reduced in diameter. IIRC, the bullet was not really "squeezed" down, because that would distort it, but a sort of "skirt" was used to allow the bullet to pass through the barrel as the hole became smaller. The idea worked, but the cost of making the special barrels was too high to be practical in a sporting rifle. It was later used in tank and anti-tank guns, though, and gave reasonably good performance, but was superseded by shaped charge projectiles which did not require high velocity to penetrate armor.
Jim
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