About as good an explanation you can get!
I have shot softer, 50-50 but found they scatter all over paper if PB so I shot the same boolits with GC's since Babore sent me both styles. That really helped and he told me to oven harden them too. I was rid of almost all fliers then and got good groups. They measured 18 to 20 BHN but it did not change the ductile qualities and I had true deer grenades! WOW, as much a mess as my soft nose .500.
I tried softer boolits in the .44 and they also need a GC but I still had fliers so I annealed the GC's and it about cured the problem. Must make the GC grip better.
Anyway there is a lot you can do with what you choose to use. I never say never and only testing and trying things out of the box can work.
I don't like the extra work of oven hardening or annealing checks but sometimes there is no choice.
I did crimp tests from full profile to hard roll, all the way to none needing to shoot single shot and never found a difference worth a hoot in groups. All you need is to hold under recoil. I had cases that still had crimp after shooting and you don't want that. It is another size die.
The worst I ever shot were factory cast loads with full profile in .454. One shot would tie up a Freedom and two tied up a SRH. The very hard crimp did not make up for no tension. I fear tapping boolits back in loaded rounds with a dowel. Imagine a proud primer on the recoil plate?