Case

The metal cylinder (open at the mouth and closed at the base) that holds the bullet, powder and primer
Most cases are made of brass and are crimped onto the bullet during the last stages of reloading
Come in two broad category types: centerfire and rimfire
The differences between the two case types is dependent upon the location of the primer or priming mix
Like bullets, come in two basic shapes—straight-walled and bottleneck
Straight-walled cases have almost the same diameter as the bullet and have little or no taper from base to mouth
Bottleneck cases taper inward as you approach the case mouth to accommodate smaller bullet sizes and large powder charges
Have different rim designs with a diameter that is slightly larger than the case diameter to prevent the case from entering the rifle bore
Cases can be rimmed, semi-rimmed, rimless, rebated and belted.

Alliant Powder ®