300 Whisper vs 300/221 neck diameter

[coldbeerchief]

what are the actual neck dimensions?

I have some Corbon 300 Whisper ammo (with SSK Brass) and it measures .331" loaded.



thanks in advance

[pug]

The brass lot can vary the actual loaded neck size of the round but most of mine run .330-.331 made from mil brass but I have had some .334 that got tossed. If you mean the actual chamber neck size then that is specific to how it was cut and with what reamer. I have measured them from .333 to .338".