SmartReloader ammo boxes are made from high quality plastic and with best technology available to make sure your ammo are store properly. But the ammo boxes are not only storing boxes, they will also work great at the Range, they will stay open since the first time you use them thanks to the hinges that connect the cover to the base.Moreover, most of the non-hinged ammo boxes in the market have a limited life due to the plastic part (that connects the cover and the base) that breaks when you open them the first time, the SmartReloader ammo boxes will last virtually forever! We guarantee for 10 millions openings!The SmartReloader ammo boxes represent one of the best seller products from our line and they are the highest quality most inexpensive ammo boxes in the industry.Fits 32 rounds caliber: Calibers: 25 / 270 / 300 / 325 / 338 / 7mm WSM, 300 Pegasus, 300 / 7MM Rem. SAUM, 300 / 338 / 375 / 7mm Rem. Ultra Mag, 333 JEFFERY, 338 Excalibur, 338 Lapua Mag., 338-378 Wby. Mag., 348 Win., 358 Shooting Times Alaskan, 404 Jefffery, 404 Nitro, 40-70 Sharps(Straight), 416 Rigby, 458 Lott, 470 Capstick, 500 A-Square, 7.62 Lazzeroni Warbird