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Yes the military quickly went to a 62 grain ball ammunition requiring a faster twist than a 1:12. Who knows for sure what bullet that they intended the .22-250 to be used with it had been wild catted for several years before it was commercialized. It was very popular for pushing sub 50 grain bullets past 4000 fps.
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Well I believe the military used the 55 gr bullet through the Vietnam war, and I believe up to 1984. There was less use for longer range shooting like there is in desert warfare. I believe that is when a heaver bullet and faster twist was put in place.
As for the 22 250, I now recollect the 50 gr was the original bullet weight as it was for the swift. It was the 4000 fps barrier, and that's the reason for the slower 1 in 14" twist.