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It's a fact of life that the more overbore you are the shorter the barrel life. If you want long barrel life get a .223 . When the 220 Swift came out the barrel steels were not as good as today and the powders available didn't help erosion either so it's better now but you'll see throat erosion at 2000 rounds for sure. Keeping it super clean will help accuracy at that point but any cartridge that uses lots of powder to get high velocity is an expensive hobby.

It is a fact that the 220 Swift barrel will have a 35-40% shorter barrel life based solely on the 220 Swift round. ( Given the same amount of shooting, there is no way around this.

The 220 Swift is a round that is rough on barrels If you are going to do a high volume of shooting I would look at other calibers that can do the same job