Originally Posted by Rusty Rocket
I originally posted "Carcano" but but took it back when I remembered how unusual the rounds were, so I posted a pic of the cartridges and figured someone else could still make a guess.
When you think about how long the projectile is, it's plausible that it could tumble very weirdly as proposed by the Warren commission.
Those bullets are probably 160-170 grains. They stabilize very well, given the correct twist. Years ago, a British hunter by the name of W.D.M. Bell used a 6.5 Mannlicher to kill a great many elephants. http://en.wikipedia.org/wiki/W._D._M._Bell
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