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Search took 0.00 seconds. Search: Posts Made By: AR15barrels
Forum: 300 Whisper Ammo and Reloading 08-29-2005, 03:32 PM
Replies: 1
Views: 2,022
Posted By AR15barrels
Depends on your chamber. 300x221 is NOT a SAAMI...

Depends on your chamber.
300x221 is NOT a SAAMI or CIP approved cartridge so there is no standard dimension.

0.335" or 0.336" is a pretty common reamer diameter at the neck.
I have also been...
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