I reload only rifle and specialty pistol rounds. Well, I used to. Back then it was easy to buy stuff like 9mm, .38, 5.56, 7.62x39, in bulk and you never had to worry about reloading them. So I only used my RCBS single for pistol stuff like .45 Colt "THERE IS NO LONG COLT", and .454 Casull. .45 everything included a .450 Marlin.
Single loading with extreme precision will give very large accuracy improvements with rifles. Measuring the chamber throat, trimming cases to best length, "exactly" measuring powder, checking and measuring "each" bullet seat, weighing individual cases and using only one from the same lot, weighing individual bullets...and on and on it goes. I could take an entire day reloading just one batch of loads.
This of course after finding out what kind of bullet your rifle likes, what kind of seat, what kind of primer and powder charge. Each rifle is its own law and its why you could buy 10 of the same rifles and each will probably like a different load then the others. Extreme accuracy is just a hobby, its not necessary for successful hunting or enjoying your sport shooting. Its just a hobby, and a fun one.