Chart for Caliber Barrel Changes....?

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Is there a chart that shows what barrel/calibers can be used for changing out in a Savage 12....?

I have a bull barrel savage 12, in a 204... and was wondering what calibers can it be changed out too.

I know that some sizes of bolt faces allow you to go up or down in calibers, but I'm goose green about it all.... because of being a bowhunter all my life.

I have a savage 12 LRP 243 bull barrel.... what would it take to change it out with the 204?

thanks...Dan