No, it won't feed from a magnum mag box. My 223AI is built on a long action but I use a single shot follower for bench shooting. A 223 mag box won't fit a long action unless you have one of the older 110s that was made with a blocked mag box for the 223 cartridge (had one back in the mid 90s).
I'm not familiar with DBMs for the 223 in a long action so can't comment there, sorry.
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