Fischer bottle carb levels?

Any one know how much carbonation a Fischer bottle can handle. I’ve read that most american 12 oz bottles are only rated up to like 3.3 (for example). the Fischer ones don’t seem nearly as thick as most the german swing tops.

Any ideas?

[quote=“mhill2079”]Any one know how much carbonation a Fischer bottle can handle. I’ve read that most american 12 oz bottles are only rated up to like 3.3 (for example). the Fischer ones don’t seem nearly as thick as most the german swing tops.

Any ideas?[/quote]
I’ve carbed beers in a couple of Fischers at 4.0 vol.