If there are diffent fill nipples, say diameter was different. Are events going to carry more lines .. or do the cheaper option of half 4.5 half 3k fill nips of exisiting fixtures. meaning at an event if say 80% show and want 4.5 fills the cues will be bigger. or the opisite at the next event...
TO be honest, over filling a 3k bottle doesnt scare me, burst disks will see to that, what will scare me is people playing with fittings while the bottle is pressurised or not fitting the reg properly, or gauge / nipple properly. Parts shooting off would do alot of damage if it contacted something soft.
Also, a little education about looking out for bottle damage would be useful, just because it is in test does not guarentee structural integrity.
It will be a tough debate and difficult to police. I just hope at the least a general education of air safety to players should be introduced. Air at that pressure should scare the poo out of people, not be looked over.