Thread: 300 BLK Compatibility w/300-221 Question
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Old 12-21-2010, 11:28 AM
1911man 1911man is offline
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Join Date: Oct 2010
Location: AR/TX
Posts: 16
Comparing 300 Whisper and 300 BLACKOUT chamber reamer prints I see the following differences:

Throat (lead) is .001" larger on the BLACKOUT
Throat is .0235" longer on the BLACKOUT
Breachface to shoulder is .0117" shorter on the BLACKOUT
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