Hodgdon's starting load for a 60 grain spire point is 25 grains. So this is low. Primer cups may have been deformed slightly inward by being pushed past the crimp, which wouldn't help. I, too, have been able to push primers past a .223 that still had its crimp—they aren't as tough as on 7.62 and .30-06 brass—but you'll get smoother, deeper and better seating with them properly cut away.
