Greetings @Kelton,
Based on some of the stuff I have read you Model 7 may have a ! in 9" twist so you may want to measure it to be sure. Remington changed the twist of their .244 Rem from 1 in 12" to 1 in 9" and renamed it the 6mm Remington. I believe that .243 barrels may have got the 1 in 9" twist as well at that time.
Regards Grandpamac.
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