Quote:
Originally Posted by mstarling
What are the chances factory 300 BLK ammo will chamber and be OK for pressure in the older chamber?
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300 AAC BLACKOUT will have elevated pressure in most previous chambers. 300 AAC BLACKOUT compared to 300 Fireball, 30-221, or 300 Whisper(R) is like comparing 5.56mm NATO to 223 or 6.8 SPC-II to 6.8 SPC - the throat is longer and can generally be loaded hotter. This is the reason why the velocity potential is higher from 300 AAC BLACKOUT.
How much it matters, I cannot say. But yes, if you want to shoot 300 AAC BLACKOUT ammo you want to run a new reamer up it.