I've explored a similar question a couple of times ,but I guess I'm not asking the right question.
I've looked up twist rates and used the Greenhill formula and with all that I've found that my slow 1-12 308 should stablize the 180rn bullets as well or better than the longer 150spbt and that either of my 1-10 3006's should handle nicely a similar 200 rn or 180spbt lastly my 1-8.5 3006' should get it done with a bullet much longer than any of those and upwards of 230 grns pointed over 250 round nosed.

If I stick with a single bullet profile let's randomly a 165 grain TSX with its high .400 bc an identical "cheap"cup and core should tip in at 175-180 and both should shoot equally well in all 4 rifles. A cast bullet should hit 195 or so and should shoot just as well even if it has to be shot slower. But the cast bullet throws a wrench in the works or so I've been told several times.

The round nose profile works out most likely weighing in from 180-210 in all forms. Again they should shoot well.

What if I go full wad cutter matching the 1.15 " length of the above that copper solid is going to hit 200 easy with the cast tipping in around 225. In pistols wadcutters always shoot well so the same should hold true if you can take the heavy bullet beating in rifles.

Why does bullet stability and shootablity change so much with a change in bullet material . By proportion the all copper bullet should have the same balance and flight charactoristics as an identical cast bullet and in scale the identically shaped cup and core will be just slightly nose heavy. Based on that the cup and core ought to be out shot by either of the solid bullets,right?

As I write I see that maybe it has more to do with the relationship of twist rates to bullet density than having to do with shape .

Humpf! Great now I have more to chew on and more questions to seek out.