After my father passed away, He left me his rifle collection. One of them is a 220 swift he had made up for him in the 1960's. The rifle is a 98 mauser action, i beleave a 22" or 24" bbl I topped it with a Nikon 6x24x40 scope. I have not shot it yet. The rifle is in perfect condition. What is this 220 cal good for in the hunting world. Is it still a popular cartridge, and is it still produced commercialy and who makes them.If the cartridge is not obsolet i would like to get the rifle bbl shortend to maybe 20" would this affect the accuacy . Thanks.