How long does a barrel have to be for a bullet .338
to attain max velocity?

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It depends a lot on the case behind the bullet.Generally the larger capacity cases require longer barrels to achieve maximum velocity.

Edited by - stubblejumper on 01/13/2003 22:14:57

When seated in which cartridge?

Good Dogwork and Good Hunting

It'll keep gaining velocity until the barrel is a lot longer than you can live with, somewhere around 10 feet of barrel length. Deciding upon how short to cut a barrel depends upon how much velocity you're willing to lose.