What's apparently not clear to you is that bumping the shoulders back a couple thousandths IS full length sizing. It is not partial sizing. If you want to use a shim for partial sizing that works, but it's a different topic and not what we're discussing here.
Correct shoulder bump is NOT partial sizing. Partial sizing is when part of the neck is left unsized, and the shoulders are not bumped back at all.
IME, what you’re calling ‘partial’ is generally called neck sizing. Partial FL sizing is typically considered to be bumping the shoulder, but not all the way back to SAAMI dimensions, while FL sizing usually means restoring body dimensions and headspace to SAAMI spec while also sizing the neck.
No, that's never been the meaning of partial sizing as I've ever understood it or seen it used. Perhaps that's what some guys call it, but that's incorrect and misleading IMO. Sizing the shoulder to fit your chamber IS full length sizing - neck, shoulder, and body all get sized full length. Anything more is just excessive sizing (i.e. bumping the shoulder back too much causing excess headspace) and poor die adjustment, most guys just don't realize it. Just because your die is capable of being run down to the shell holder doesn't mean that is correct "FL sizing".
Neck sizing is a different thing from partial sizing the neck with a FL die. Partial sizing still reduces body diameter to fit the chamber easily while leaving an unsized ring of the neck to center the cartridge. The neck is only partially sized, hence the term.
Regardless, bobber257's idea of "less fiddling" is actually a lot more fiddling than just measuring and adjusting the die correctly.
