However, when Winchester began to develop the commercial
version, they based is on a necked down 6mm Lee Navy case. In 1935, Winchester
introduced the round, along with it’s Model 54 bolt-action rifle. Then, in
1936, Winchester released the model 70 Bolt Action, with the .
220 Swift being
one of the standard calibers in which the Model 70 was chambered.
Though it was perfect with small game, the .220 Swift got a
ton of bad press due to some issues it caused
with guns. For example, early
rifles chambered in the Swift had extra soft barrel steel with the odd ones
even having a bore size of
.223. It’s believed that the increased bore size
stemmed from the fact that the
.22 hornets prior to the end of World War II
.223 in bore size and then reused in the .220 Swift rifles. It is also
said that the
.220 Swift caused barrel failures extremely fast due to it
Each box contains 25 once fired brass shell casings. Headstamps are mixed. This is unprocessed brass sourced from commercial shooting ranges. The casings have been washed and polished, but not resized and may still contain the spent primer. It is recommended that all brass be inspected prior to being reloaded and fired.