Norma 220 Swift Cases (100)

Description

220 Swift

This is the fastest production cartridge ever made, dating back to 1935 when Winchester introduced it in their model 54 bolt action rifle.

Originally the inspiration for this design came from Grosevenor Wotkyns who was experimenting with necking down the .250-3000 Savage case.

However, Winchester chose to base their new design on the case of a 6 mm Lee Navy, a semi-rimmed cartridge from before the turn of the century and already then heading for obsolescence. It was necked-down to .22 caliber and loaded with a 48 grain bullet with a muzzle velocity of no less than 4110 fps.

Norma 220 Swift cases take the Large Rifle Primer.

Norma Brass

Norma cases are made of the best possible raw materials with the narrowest tolerances, and they deliver accuracy round after round. Superior quality ensures a long life, and many reloads.

The case neck is annealed to become softer. This prevents gas leaks and enables the case to hold the bullet firmly for at least 10 years without cracking as a result of aging material.

Further down on the case body, the hardness increases to avoid unnecessary stretching. If it is too hard, it would bring the risk of cracks.

Furthest down, around the primer pocket, the brass should be firm. Here, the hardness is nearly twice that of around the neck.