Lew - when we talked about this on the phone earlier, I wasn’t sure of anything about the loads in my own collection. Firstly, I have never seen this, or any other plastic Super Vel box. However, my Super Vel box collection is poor. I have only five or six and only one subsonic box, for 125 grain FMJ subsonic. Total cartridge weight for that load is 184.8 grains.
I have 10 Super Vel-headstamped subsonic loads in my collection:
SUPERVEL 9MM LUGER(Rem-made case with SV headstamp) 184.8
SUPER VEL 9mm LUGER short curved primer crimps 222.7
Same, long curved primer crimps 222.3
same, no unusual markings 185.5
same, all blue primer 184.2
same, all black primer, black bullet tip 184.8
same, all green head and primer 186.0
SUPER VEL 9MM LUGER, green head, all green bullet, smooth
case cannelure 224.9
same, green bullet tip, all-red primer 224.4
same, black bullet tip, all-red primer 224.2
All rounds have a fairly normal ogive FMJ GM bullet, except the two rounds with total cartridge weight of around 222 grains, which must have a bullet weight from 158 grains to 162.00 grains, and they have a very blunt RN bullet.
It seems that the norm for Super Vel Subsonics was a 125 grain bullet, which corresponds to the one box I have.
I have never seen the one that you show, which must have a total cartridge weight of somewhere around 190 grains.
It is hard to show it typed on line, but there are three distinct headstamps in those above, all saying the same thing. One is made by Remington, and it has no gap between “Super” and “Vel” and while the “MM” is upper case, it is shorter than the “9” on on the headstamp. another has a gap between the two words of the name, and generally smaller, finer letters, with the “MM” the same height as the “9”. The other has lower-case “mm”.
I don’t know if Super Vel loaded the two heavy bullet subsonics with the odd triple, curved-line primer crimps, but they have the Super Vel Headstamp.