This is straight from the Remington Website found here ......
http://remington.custhelp.com/app/an...imers/r_id/166
Quote:
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In rifle cartridges, the 6-1/2 small rifle primer should not be used in the 17 Remington, 222 Remington, 204 Ruger or the 223 Remington. The 7-1/2 BR is the proper small rifle primer for these rounds.
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I have always used 7 1/2 if I use Remington.
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Admiral Isoroku Yamamoto - “You cannot invade the mainland United States. There would be a rifle behind each blade of grass.”
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