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9mm may be the easiest of those three to actually get started loading , between components ( besides primers) and just the availability of brass and it being straight ( very minimal taper) vs being a necked rifle case338, 308, 270 and 9mm.
Start with 338 though and as I graduate...move to next caliber
Not primer hunting?!? loli have the lee loader now. Just fighting the powder wars now...lol
how so? at least you can't double charge them9mm is about the only thing I reload - Necked rifle cases concern me.