.400 vs. .401 bullets

[Jakywaky]

Got my components to reload 40 s&w. all I need are bullets. What diameter bullets do I need .400 or .401? Thank a lot.

[milw50717]

Jacketed = .400. Plated or Cast = .401

[Kahyne]

I was wondering the same thing. One manual says .400 and another says .401.

[milw50717]

Just out of interest what manual says .401 ?

[BigBronco]

The diameter is more critical with lead bullets to prevent gas cutting and leading your barrel. Jacketed you can relax a bit on size and shoot as they come.

[Kahyne]

Just out of interest what manual says .401 ?

I could have sworn I've seen it somewhere. I think I have it mixed up when purchasing projectiles. Sorry about that.