Iron Content of Rifle Ammo (SS109/M855, M59, M61, M80, M855A1, etc.)

[Rupert]

Originally Posted by Icelander

Ah, indeed. I suppose that happens, as 7.62x54R rounds are used for the same purpose.

Swaging it down sounds great.

Unless your rifles already have tight bores, using .310" bullets in rifles intended for .310" bullets won't matter too much. Rifles intended for .308 have a nominal .300 bore (measured from land to land), so 2/1000ths of an inch extra won't be excessive in a modern weapon as long as the round isn't a really hot one.