damn you and your maths.
but realistically FSR do travel faster at a given pressure. If you set your marker to for .68 paintballs at 280 your FSR will be firing 295-305. That's part of the issue, a lot of unscrupulous players (what in paintball? NEVER...) will chrono 280 with a .68 ball then switch on the fly to FSR (ahem Tactical Ironmen I am looking at you) and end up launching a 10-18 less frangible projectiles above ASTM recommended guidelines. sometimes full auto. So as much as FSR are a part of magfed play (which I do a lot of) I still get complaints from players. All it takes is one guy coming into a room who switched to FSR after chrono and dropping 10 FSR full auto into you at 10' shooting 305 FPS and you are gonna have a bad day.
I really think that Tiberius has done a pretty huge disservice by not getting them ASTM certified tbh. I know they were designed for LEO and less lethal applications, but to unleash them on the public without that level of due diligence seems a bit amiss in my books. I don't blame Cossio.
It is going to have a ripple effect too, I know I got some push back from players once by disallowing them, and Tiberius was actually so bold as to suggest that the field (which has been in business for 20+ years and is WELL known) switch insurance providers. When they declined, Tiberius actually declined to sponsor the event.
So I am going to back Cossio on this one. And agree with Simon. This CANNOT have been a surprise. My run in with FSR and insurance was 8 months ago. Viper saw this coming and should have known better.