Tom,
I strongly suspect the Hornady .30 180's you and your dad had trouble with were before Interlock days, but dunno. I know the first Hornady bullets I handloaded were 150-grain .270's in the mid-1970's, and they were pre-Interlock. Don't recall exactly when the Interlock ring was added (which helped considerably as far as bullets staying together) but believe it was sometime in the early 1980's.
