It's all relative, to a degree. Guess you could say some bullets are more premium than others. I've seen years that were so lean, any bullet was a premium! All my "fun" shooting was done with wax....
When working up my loads for my 32WSpcl, I used the jacketed data (as recommended by Lyman and others in the absence of cast data) for 170gr jacketed to work up with a 183gr cast. The cast slip down the barrel easier than jacketed and you "always" start at the bottom and work up anyway, so it was a simple process and allowed me to use slower powders than what was listed in the old Lyman manual for cast. It's no trick matching or exceeding factory ballistics with a cast bullet in the leverguns, Elk and deer don't know the difference; just takes patience and practice.
Regards,
Sweetwater