400 cor-bon (corbon) case is a 45 auto+p based case necked down to 40 caliber.The primer pocket was changed from large pistol primer to small pistol/rifle primer in 12/00.Test results concluded no adverse affect from switching to small primer pocket.Cor-bon is now recommending win.Small pistol works best and if using small rifle remington 7 1/2 works the best.Most popular auto pistols chambered for the.45 auto can be converted to the.400 cor-bon cartridge.Recommended Usage: ReloadingType: Handgun/RifleMaterial: BrassStyle: SmallLength: 0.894"-0.899"Gun Type: Rifle/PistolMetal Type: BrassCaliber Or Gauge: 400 Cor-BonQuantity: 100 Per Bag