These are the original CASE-GARD ammo boxes. Made of virtually indestructible polypropylene that will not warp, crack, chip, peel, expand or contract, MTM CASE-GARD rifle ammunition cases are still the first choice of rifle enthusiasts throughout the world. MTM's famous living hinge boxes are guaranteed for 1 million open-close cycles or ten years. Snap-Lock latch protects contents from accidental spilling. In the late 1960's, the RS-S-50 was designed specifically for benchrest shooters. The CASE-GARD 50, which is available in eight sizes will hold .22 Hornet to 375 Remington Ultra Mag., with each cartridge resting in its own individual compartment. Each CASE-GARD 50 ammo box is supplied with a load label for recording load and sight data. All rounds listed as bullet up, unless noted. See ammo box charts for more calibers. RS-S-50 for cartridge sizes: 22-250 Rem., 22 BR, 22 Cheetah, 22 PPC, 22 Rem. Jet, 22 Sav. HP, 220 Rus., 224 Wby. Mag., 250 Sav., 30 / 35 Rem., 32-40 Win, 351 / 401 Win. SL, 6mm PPC USA, 6.8mm Rem. Spl., 6mm BR-DX, 6mm Norma BR, 7mm BR, 450 Bushmaster, 7.62 x 39 Rus.. Max. OAL= 2.50"