Yes there are 10 rd dbm mags 4 308. I am not sure if they exist for 223. You can call Savage and buy magazines and many parts directly from them.
No sled for centerfeed that I am aware of which is what you have.
You will need a new bolt head and baffle to change from 223 to 308. And new magazines.
The 223 magazines have a spacer to push the 223 round forward in the magazine.
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