IMI is very milspec.
SO is Winchester ball marked WCC.
Federal high end hardball is as well.
S&B is made to military spec as well (Czech Military :smile:
Try natchezss.com or ammodeal.com.
Wideners reloading has a lot of IMI also.
I love IMI, but it is usually 60 bucks more per case than S&B.
S&B feeds perfectly in all 12 of my 1911's, so I do not look any further.