I have Lee Loaders in .30-06 Springfield, .30-30 Winchester, 8x57 Mauser, and I just found a 7mm-08 that I picked up. You should only use virgin brass to load new rounds, or use brass fired from your rifle only. These Lee Loaders only neck size the brass, which is fine. It prolongs the brass case life. Reloading brass shot from your own rifle is particularly important with the .30-30 Winchester if used in a lever-action gun, like my Winchester 94. I do not use case lube when reloading with a Lee Loader, these are made for tolerances without lube. If you use lube, correct resizing of the neck may not occur.
I just loaded 51.4gr IMR 4064, 150gr Nosler AccuBond, CCI Magnum primers, and once-fired Remington brass and got a group within the size of a quarter at 100 yards. I used my Lee Loader.
I got excellent 1 1/2" groups at 100 yards out of my Winchester 94 with iron sights using 33g IMR 4064, Winchester primers, and Winchester brass.
Take your time using the Lee Loader, it is all you need to load accurate ammunition. Many benchrest shooters only neck size their reloads.
My k98 Mauser was not shooting on paper at 100 yards, so I duplicated the original German military specifications (almost) of 154gr spitzer at 2936fps. I loaded 150g Hornady spitzer to around 2915 and was able to shoot a 2" group at 100 yards, and that with the rifle's 2-stage military trigger. I loaded this ammunition using my 8mm Mauser Lee Loader.
One recommendation: Standardize your loading processes. You should always check case length and trim as necessary. I use Lee case length guides and cutter. Keep cases separated according to manufacturer and number of times fired. Only load brass shot from your rifle, if using Lee Loaders. Once fired, the cases are 'fire-formed' to fit your rifle's chamber specifications. Get a primer loader. They load primers quickly. I 'blew' a primer using the Lee Loader rod and primer tray holder. Luckily, I had ear plugs in b/c I had read this could happen. I paid $7.00 for a reconditioned Lee Auto Prime directly from Lee Precision, and it works very well. Anyone who reloads should use one.
Good luck with your Lee Loader.
P.S. I use the old Lee Loaders to load my own 12 gauge shotgun ammunition for turkey hunting. They work just fine. I've got one for 2 3/4" and 3" shells.