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. RM-50 for cartridge sizes: 220 Swift, 300 Sav., 338 RCM, 225 / 243 / 307 / 308 Win., 338 Fed., 25 / 32 / 6mm Rem., 28-30 Sevens, 360 Nitro Express 2 1/4, 5.6 x 52 Rimmed, 6.5 Creedmoor, 6.5x50 Jap Arisaka, 6mm-284 Win., 7.35 Carcano, 7.5 x 54 French MAS, 7.65 x 53 Mauser, 7mmTCU, 7mm-08 Rem.. Max. OAL= 2.90"