I have been reloading on a single stage press for over two years, actually I use two, an RCBS and a Lee, both will have the same die for a specific cartridge but one may be the resizing and the other the seater.
And digital calipers, an electronic scale, case length trimmers. My loads vary from 9mm, .40, 10mm,.44, .45,and the rifled ones from 7.62x39 on up to .375. Originally I was just doing hunting rounds, developed nice precise Barnes bullets cartridges. They are all done one at a time, no turret press.
But in the last ten years it tends to build up, and every year a new bullet comes out, a new powder and even some new calibers, for awhile I was into the .45 case with it necked down to a .40, even bought the dies and a barrel for on my Glocks, but it was a nightmare to bottle neck the cases and so I have these rounds that I may just pull the bullets out of, it just wasn’t reliable to feed the 400 Corbon, but a factory load would supposedly feed.
My recent load duplication was the Corbon .45acp with the Barnes 185gr solid copper XPB bullet. That actually went quit well and I am now working on a 10mm with the Barnes XPB or as the box says M/LE Tac-XP (same as the XPB).
Barnes won’t publish 10mm data, the bullet has a unique deep cavity and being copper penetrates sheet metal and auto glass without didintegrating and then if it hits soft tissue the cavity opens up the head like a miniature star. The Barnes Triple shock big game bullets are literally one shot drop cartridges. Sure they are speny, but then I don’t plan on having C-mags and visiting a theater full of bears either.
For a novice one at a time, and I have made mistakes, nothing serious, when you attempt to speed up the process you may wind up with hundreds of rounds that may be too long, the primers upside down or bulged cases.
And some rounds like the .380 are terribly finicky if you are just even a few grains different between loads. I again would say the .45acp is the most forging and easiest to load for a beginner.