I haven't read through the whole thread, but here's my take.
I've reached the age when I've mostly retired from hunting, so I don't care about killing stuff. However, I've gotten into lever rifle silhouette, and some claim Speer 30-30s work well or even best.
So, short version, I don't shoot Speer bullets because I can't find and get them consistently. Availability, especially 30-30s, has been spotty at best. I don't have the time or patience to screw around with an inconsistent supply. I go with alternatives.
'nuff said.
Paul