I found those interesting. I saw some folks testing SPP and SPmagP and seemed like factory springs were same. Interesting test on the SRmagP. I would think that SRP in general would command a premium compared to SPP, but testing you can see.
I know some PCCs are more reliable with harder primers, but that was with older surplus ammo where we noticed harder primers.
I would like to try this test again with CCI SPMP and SRP. I've seen the videos on YouTube of folks setting off those primers consistently with stock springs. Which makes me wonder how much thicker or denser the the SRMP is. I haven't researched it or found the urge to measure it myself.
Also from what I read from other forums but never verified for myself is that CCI is one of the more "tougher" primers to set off across the board. Maybe is if I tried SRMP in a different brand I might get away with stock springs or lighter than the heaviest springs to ignite a round. If I ever try it out I'll post the results.
I'm only buying whatever the gun stores have available lol. Like I said, I'm not being picky in today's age. 7 months on a waiting list