I had a MEC shotshell loader at age 15, one of the precursor models to the 600 Jr. The only centerfire rifle shooting I did was deer hunting back then, all done with factory Winchester ammo in 30/30 and 30-06. I DID retain the fired brass, though--we shot up last year's rifle rounds doing sight-in prior to deer season. I didn't really shoot enough CF rifle to justify the outlay for reloading gear, but did stumble across a cardboard-boxed Lee Loader in 30-06. "One of these days, maybe". There was a nice pile of 30-06 and 30/30 brass under way. I was all about shotguns until about age 21.
A S&W Model 28 in 1976 prompted purchase of the 38 Special Lee Loader, which prompted me toward loading the 30-06 with the existing Lee Loader. For a while, anyway--the RCBS Jr. press and a bunch of other metallic reloading tools from Yellow Mart in Indio really got me started down the rabbit hole. Still exploring its drifts and shafts!