The hollow base does seem to me to be an ingenius design.
I'll go with what you are using in 9MM (124gr., HBRN-TP , right? What is TP ? Totally Plated ?(even the bottom)
and 40S&W (which? 155 or 165? HBFP or HBRN?) Why did you choose whichever you chose?
What about the two 45s? 185 HBRN, 200 FP, 200 SWC --about $37.88 /250
ZOOM 2X, pronounced "ZOOM ZOOM", is the tag on my supercharged, etc. Miata.