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Old February 14, 2020, 11:42 AM   #26
Senior Member
Join Date: August 25, 2008
Location: Potatoes and Hops
Posts: 12,266
The same velocity will not be achieved.
Bore expansion ratio is important for building pressure, and will result in the smaller caliber projectile - even though of the same weight - leaving the muzzle faster than the larger caliber projectile.
Don't even try it. It's even worse than the internet would lead you to believe.
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