Derpit,
I checked and the rule does exist, I changed the 256 to 512 and rebooted.
It now reads:
ACTION=="add", ATTR{idVendor}=="03c3", RUN+="/bin/sh -c '/bin/echo 512 >/sys/module/usbcore/parameters/usbfs_memory_mb'"
# All ASI Cameras and filter wheels
SUBSYSTEMS=="usb", ATTR{idVendor}=="03c3", MODE="0666"

Did not make a difference, shame.

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