Yeah, it's based on the 9.3X74R case, but pressure is higher. CIP max average for the 8X75RS is 3800 BAR or 55,114 PSI. That's higher than I would be comfortable with in a double for my own use. For comparison, CIP max average for the .375 Flanged Magnum is 3250 BAR or 47,137 PSI: the .30 Super Flanged (.300 Flanged Magnum) is 3200 BAR or 46,412 PSI; The 9.3X74R is 3400 BAR or 49,312 PSI; the .470 NE is 2700 BAR or 39,150 PSI.

The long 8 is a fine cartridge and a better choice in a double rifle than a 63,000 PSI Belted Magnum, but it isn't a low pressure cartridge.
------------------------------------------------------------------------------------------------------------