the bottles will hold up to and beyond 300 bar maybe a bit more as Ive never filled beyond 300 ,as it says ive never filled beyond because i have only got a 250 bar regulator.get your facts right.ta Born what hunter....???? that gets me thinking ..thanks for your post .
there only pressure tested to that mate 2oobar fill not 300bar pal suprised you havnt be blowing seals or locking up