Average is prob 200 yards. I hunt one overgrown field we cut lanes in like a sendero and you can shoot 500 yards one direction and 415 the other. There typically isn’t time for ranging so flat shooting is very beneficial, as is bucking the wind. If shots were limited to 300 yards and in, I’d just borrow Gomer’s 308 and call it a day.
Or you could just move closer, but I guess then it wouldn't be as cool.
Congrats on your new to you cartridge.