Bullet sizing is another rabbit hole that divides these two methods. Many would recommend that you size a lubed bullets .002” over your slugged size, or even larger.
Many have found that PC exhibits it’s best accuracy when bullets are sized between .001” to just .0005” over the slugged size. The rational is that by minimizing the damage to the PC jacket as it enters the throat, it will reduce the possibility of leading associated with jacket damage, and improve consistent flyer free accuracy.
Different systems require different solutions. You would never size muzzle loader bullets the same way you size breech loaded cartridge bullets. Yet both systems can achieve fine accuracy.
PC just isn’t going to be as accurate as a finely tuned lube based load(lube flyers and fouling shots excluded). But for many it’s benefits out weight the lack of accuracy. It is unaffected by temperature, doesn’t require fouling shots, and you don’t get lube flyers. It is less accurate, but more consistent.
And, for the new caster getting started, PC is much cheaper than a lubrisizer with all their different dies and top punches. A thrift store toaster oven, a grocery store oven thermometer, and a homemade wire basket are all you really need. The material costs of lube vs powder is insignificant. The cost benefit to the new caster has only gotten better now that we have both the Lee Breech Lock modular sizing system and the NOE modular sizing system available to the new caster.
JM