what shot you putting in it?
About 110ish jet sizes are .055 nitrous and .026 fuel
alos where do you get it filled?
There's 3 companies around here that fill bottles
is it a UK bottle? 
You've been reading a certain website

No its a good old USA bottle which is about 15 years old
Now I'm not saying the engine will last the next pass

, but at the moment its lasting