It really depends on how you think. I like a safety margin, so I don't play with high pressure much.
I'll put it in ringing/climbing terms and safety factor.
Safety factor accounts for how much error you can have in your load weight before breaking the system. You will not test every system to failure, and most components will not be new, so the calculated strength is best case.
Life safety should have a safety factor of 10. So if you need to static load a 200 pound man the average break strength of every component must be 2000 pounds or above. Thus, lots must go wrong for something to break and the person die.
Can a rope with a 250 pound mean breaking strength work? Yes. Can 550 cord work? Yes. Unless the cost of not doing it is catastrophic and you have nothing else available, one is flat stupid to use such systems.
Now, safe pressure is like a safety factor of 10, it is the standard and makes catastrophic failure very unlikely. As you push that up, you have less and less room for error. Now, you are running 74K PSI load, the chamber is wet increasing bolt thrust, you have a carbon ring, the bore has a slight amount of dirt in it from being in the field, and this load is on the hot side of the distribution. No one of those would result in failure, but all might come together and at best leave you with no follow up shot. At worst, well you get the point.
100 fps is not worth it to me. The brass and action don't matter. Everyone else is free to do as they please.