If they are like the AI mags the .338CIP mags for the Lapua will work, but make sure they don't have forward ribs, and they won't give the OAL you want. I had to cut mine back to 3.755" from the 3.785" suggested on the DE site. I had to take the ribs on mine out and I did a really poor job with the Dremel. Kyle at XLR Industries says AI makes em without the ribs, or if you buy an AI mag from him and they do have a front rib he will mill it out for free(found that out after I already did mine!). Not sure about a 300WM mag as I don't one. I have not noticed any difference in accuracy(only in the 100yd testing stage though) between the mag length and the 3.785" rounds.
[img width=600 height=448]http://i944.photobucket.com/albums/ad288/319Savage260/AIMAG.jpg[/img]
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