Wyatts extended box mag for 338 Edge

I don't see why it wouldn't work. Just confirm the OAL of the magazine and compare to your desired bullet length. I went with the Wyatt's 4" internal BDL box because most of those mags only let you seat to like 3.79" and my rifle is throated for the 300gr Bergers. It holds 3 internally, which is plenty for a non competition, primarily hunting rifle for me.
 
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