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Old February 14, 2012, 02:41 AM   #5
Clark
Senior Member
 
Join Date: December 4, 1999
Location: WA, the ever blue state
Posts: 2,817
To get the BB gun sound in a 30-06 you can only use one grain of powder.
To get the most velocity, the bullet must compress the powder.
If the bullet has to jump a long way to the rifling, accuracy is terrible.

The the old guy out in the middle of nowhere with two lathes make adapters is gone. His link went dead.
http://alexcartridge.com/

Now all that is available is that guy in Alaska. And he uses direct firing pin impingement, which makes as long a jump to riflings as possible.
http://www.mcace.com/
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