The Lyman Custom Fit Loading Block with 0.615" hole diameter is engineered for precision reloading of large rifle cartridges. Made from tough durable polymer this block holds 50 cartridges and features secure nesting design for easy storage.Lyman Custom Fit Loading Block with 0.615" hole size50-cartridge capacity with secure fitDurable polymer constructionCompatible with 15 cartridge types including .338 Lapua .45-70 .460 Wea. MagFits: .30-378 Wea. Mag .338 Lapua .338-378 Wea. Mag .348 Win .378 Wea. Mag .40-65 .416 Rigby .416 Wea. Mag .45-100 .45-110 .45-120 .45-70 .45-90 .460 Wea. Mag 7.62x54RBlocks nest together for organized storageClearly marked hole diameter for easy identificationEssential for serious reloaders working with magnum and large bore rifle cartridges providing safe organization and precise cartridge handling during the reloading process.