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Old June 8, 2017, 05:15 PM   #13
Slamfire
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Join Date: May 27, 2007
Posts: 5,261
I believe in the 1920's there were experiments with swage bore weapons that pushed projectiles up to 6000 fps. These barrels got smaller by a considerable amount as the projectile approached the muzzle. I recall that bore life was horrible.
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