The Compact Universal Loading Tray (LT-50) accommodates most traditional cases sold in the United States. Each side is for different caliber. Really compact for tight loading benches. Rifle Calibers = 222, 223, 22-250, 270, 308, 30-06, 375 H&H, 264, 30-30 traditional sized cases. Handgun Calibers: 32, 38, 380, 41, 44, 45. It will NOT hold the newer rounds like the WSM, WSSM, Rem Ultra Mags and the 500 S&W Mag.