Rev, I inquired about the OAL of the mag box.

Response;

"I loaded the magazine with 4 7X57 Mauser...new Sellier & Bellot 173 grain SPCE cartridges, and they measure exactly 3" in length.  I also loaded 4 Winchester 7mm 175 Grain Soft Point cartridges that measure 3 1/16" in length and they also operate properly."

“Factio democratica delenda est"