Rosewood,
IIRC, I thought Sharp Shooter Supply used to offer a change over / conversion kit to allow the use of the more common 223 SA bolt head to make just what you are interested in possible. I'm not sure they still offer it. I'd send them an email and see what they say. A reply might be delayed, but personally I have always had my inquiries to them answered. If you decide not to try that, you might be out of luck unless you trade/sell the 243 as you mentioned.
Perhaps someone with more experience will chime in with more information.
Wildcat
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