It can go the other way too, around the time that the .17hmr came out, I remember reading somewhere that it was actually invented almost by accident. Little known fact but apparently one of the first 22 magnums had been used for culling since the early 1960s, shooting hundreds of rounds most working days and all without ever being cleaned. The copper fouling built up so much that the rifle (if you could still call it that) eventually became a .17 caliber. Along the way there was quite a period of time where it didn't shoot very well at all, the .21 calibre and the .18 calibre times were the worst from memory, but when it got down to .17 it hit a node so good that word of it's amazing accuracy and terminal ballistics performance caught the attention of a Hornady employee. On aquiring the rifle (again I use the term loosely) it took some work by the company to create a cartridge with head space that actually allowed folk of average strength to properly close the bolt on the 'prototype', but once this was done, the .17hmr was born and the rest as they say is history.
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