Thanks for the info. I knew about the big release of carbines in 63. It just seems strange that none of the major ammo makers apparently made any commercial ammo for so many years.
Not strange they didn't sell much, because of so much cheap surplus ammo, just strange that they didn't list any in the usual sources, until 64?
I would have thought, with so many carbines "coming home" that somebody would have at least offered SP ammo after Korea, but we can't seem to find any ads or listings from the mid 50s.
All else being equal (and it almost never is) bigger bullets tend to work better.