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Old February 26, 2013, 12:13 PM   #8
Join Date: February 26, 2013
Posts: 44
You can get away with cast lead in a 300 with subsonics because the velocity is so low.

It sounds like a gas port/gas flow issue to me, were I you I'd pull the front sight post and measure the port.

Also, if you SBR that barrel, depending on how short you go, it may not work with carbine gas. Short .300's really want pistol gas.
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