Dunno about the mag well itself... the magazine box on mine measures 3.770" inside, long enough for S250MK, S300MK, and L300 Scenars seated to the lands (book length for factory .338 LM ammo is 3.680"). The B300 Hybrids are considerably longer. No idea what the loaded length on a .338 Edge w/ S300MKs would be.
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