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Hi Samuel, yes sir, this will fit .300 PRC rounds. The .300 PRC is based on the .375 Ruger Compact Magnum; call it a .30-375. Maximum cartridge overall length is 3.7 inches Stay safe & have a great day!

Hi Samuel and welcome. Yes Sir, this will 110% fit the 300 RRC ammunition no issue. Cheers, stay safe and enjoy!

Yes this box will hold large magnum cartridges.

yes it will fit .300 PRC rounds with no problems