These are the newer 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. Full length mechanical hinge that is guaranteed for 25 years. Snap-Lock latch protects contents from accidental spilling. Textured finish makes it easier to grip and harder to scratch. In the late 1960 s the original RS-S-50 was designed specifically for bench rest shooters. The CASE-GARD 50 s are now 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. All MTM Case-Gard ammo boxes are MADE IN USA in our factory in Dayton Ohio. We now use a full length mechanical hinge on most of our R-50 s. 22-HORN-10 uses an insert to hold the bullets. This gives the ammo when placed in the bullet down position bullet tip protection. Some competitive target shooters and predator hunters prefer this. The 22-Horn is sold only in green and uses our living hinge design. RM-50: 220 Swift 300 Sav. 338 RCM 225 / 243 / 307 / 308 Win. 338 Fed. 25 / 32 / 6mm Rem. 28-30 Sevens 30 Rem. AR 450 Bushmaster 360 Nitro Express 2 1/4” 5.6 x 52 Rimmed 6 / 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= 3.04.