As far as I know, the HSE standards for composite wrapped bottles are slightly stricter than DOT ones - which is the reason why HSE bottles tend to be slightly more expensive.
I don't think anyone need worry too much over a bottle exploding. If you consider a 3000 psi/211 bar tank is tested at 4500 psi/300 bar and that in order to be HSE certified the actual burst pressure for that design of bottle cannot be less than _twice_ the test pressure (9000 psi/600 bar).
High pressure air has been on the paintball scene in the uk since about 1993 when Storm started using the Air America kits and I've not heard of any exploding bottles since then.
A far more likely problem is the bottle reg going wrong and suddenly pushing 3000psi through a low pressure hose from reg to gun. I've had that happen before while filling a bottle and having a hose go BANG! is not a pleasant experience
....or the threads on the bottle neck could strip and fire the bottle off the gun backwards.....or...