Single stage is great if your doing a hundred rnds or so , but gets tiring when doing a few hundred weekly.
Same goes for a manual trimmer.
This is why you should start with a single stage, loading for a bolt action rifle. We rarely go through more than 30 rounds per range session with our bolt actions, and if you've fired a case in your rifle ( - except for a Lee Enfield; see below - ), you only need to re-size the neck; your brass will last much, much longer. Our rifles are .223, which is just the thing for ruthlessly slaughtering pieces of paper; I bought a bucket o' used brass, 2,000+ for $150 but they're all through AR's; autoloaders stretch the brass, since the action is opening while there's still pressure in the barrel, so they all need to be full-length resized. Use enough lube on the cases, and don't worry about inward-dents caused by maybe using a bit too much lube - they'll fireform to fit your chamber when you shoot 'em off. My wife's .223 has a slightly more generous chamber than mine, so we segregate our brass; hers goes into her rifle, mine goes into mine.
The cases? - new ones need the full prep; my rifle has a tight chamber, and they won't fit otherwise. 1) clean - Thumler for the win!, 2) full-length resize, 3) primer pocket swage, at least a third of them, 4) trim - full-length resizing stretches the cases; I've never had one not donate brass peelings to the top of my case trimmer, 5) inside / outside chamfer, I have a chamfer tool - somewhere - eventually I gave-up ever finding it and bought one, and was APPALLED at how much that li'l chunk of iron is worth nowadays! Then it's ready for primer, powder and bullet.
Why not a Lee Enfield? - it locks-up at the back of the action, so the action stretches when it fires and the brass does too. And the brass work-hardens when it stretches, and when you full-length resize the cases; eventually it gets brittle, and splits. I've talked to people who got many reloads out of their Lee Enfield brass, and other people who were lucky to get 5 reloads before the cases split. I shoot .303 too, but my rifle locks-up at the head of the bolt; I've never had a cartridge case split in my rifle.
Once you learn the game, go for a progressive press; but it may not be the panacaea you hoped for. We have a Hornady LnL, which I use for .223's; but the charge thrower is not accurate enough, especially with Varget, whose granules are large enough to block the thrower, so our .223 is a multi-stage, multi-press operation:
- size the cartridge cases - neck-resize on the Hornady if they've been through our bolt-actions already, full-length otherwise, on our old RCBS single-stage. Cast iron, plenty strong enough for the significant force you need to full-length resize. Another point to pick-up - BUY USED!!! I doubt I paid $20 for that RCBS, but I've had it a really long time...
- prime, by hand; I've got one of the Lee primer tools. It's really neat, and quick; but a downside of surplus brass is that a lot of it is ex-military, with crimped primer pockets. This was done so the serial recoil of a machine gun won't back the primers out, and it also helps resist moisture, but that primer pocket will do just about ANYTHING to resist you putting a new primer in - and as noted above, primers aren't really something you want to put a lot of force on. So once my mil-surplus brass has gone through the Hornady full-length resizer die on the RCBS single-stage, I equip it with a RCBS primer pocket swager and give all their primer pockets a loving squeeze.
- Throw charges; we use a RCBS (yeah, love dat green) automatic powder scale / charge thrower; lotsa people make those, for significantly less than what RCBS wants for theirs, which begs an uncomfortable question; so I checked the reviews and paid the extra for the RCBS, it's pretty well considered the best on the market.
- Cartridge and powder meet their bullet and go into the Hornady LnL. If I'm just neck-resizing, the case doesn't need any lube so I neck-size / deprime on the LnL; but I don't use the LnL to prime the case. The LnL is a temperamental beast, and most of the trouble I've had with it was in the priming mechanism, which is somewhere between Mickey Mouse and Rube Goldberg; and (I gather) all progressives are a royal pain to change primer sizes - if only because if you don't run them entirely out of primers before you try to change sizes, the ones left in the tube are going on the floor (and half of them under the freezer). And it's astonishing how hard it is to come-up with 100 cases that you can put small rifle primers in, halfway through a reloading session. So even when I size / deprime on the LnL, the cases go to the Lee hand tool for priming.
Incidentally, do pay attention to what you have in what ( - powder as well as primers - ). Small rifle primers are considerably tougher than small pistol primers, to withstand the much higher pressures; this suggests that the trick titanium firing pin in your high-buck Kimber will just bounce harmlessly off them, rather than make it go 'bang'. I do all my large pistol primers on the LnL, and all the small pistol primers on the Square Deal; and I prime rifle with the Lee tool.
- Oh yeah - case, powder and bullet. They go onto station 4 of the LnL, and get bullet-seated. Then the press rotates them to station 5 and they get crimped - this is a separate operation, and on the LnL (with Hornady dies; I don't buy junk if I can avoid it), I NEVER got the bullet seater adjusted to where it would seat the bullet to depth and crimp the case mouth in one operation, despite how carefully I measured / trimmed the cases; I'd either end-up with bullets wobbling in the case or (if I turned it down just a bit further) A new, and much bigger case shoulder. "Ah yes, one of those three-necked rifle rounds..." It's a good thing I bought all those milsurp cases, I ruined a number of them trying. So I bought a Lee universal crimp die, which sits at station 5.
The whole thing isn't nearly as long or as tedious as it sounds; but it is tedious, and I'm glad we shoot-off rifle rounds a lot slower than a .45 will chow-down on a box of pistol rounds. I think I'll put my money into blue-chip railroad stocks, sooner than pick me up a mall zombie gun...