Possible hazard…need help

Now I’m familiar with the carbon fiber bottles having a max pressure of 250 bar and tested at 310 bar. Some CF brands allow for 300 bar fill which is nice. However, with aluminum bottles I have no experience.

I got this 500cc aluminum bottle that is probably from an older FX. On the bottle it says tested to 375 bar. I intend to put it on an Avenger that is capable of 300 bar fill (4350 psi).

Can I fill it to 300 bar safely? Or should I stick to 250 bar for safety?

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