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Not familiar with all the various 300 Win Mag magazines that Savage has offered in the nearly 50 years since the 300 Win Mag was first introduced.
Some of those magazines have "bumps" where the cartridge shoulder is to help prevent forward movement and bullet nose damage in recoil.
These "bumps" might interfere with the 458 Win Mag operation since it has no case shoulder.
Fred Moreo of Sharp Shooter will know.
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