Sperior #2 and #4 bring back memories from the 40's. They were the only films easily available during the war. #2 had a Weston rating of 50, and #4 a Weston rating of 200. They were sold in 27 1/2 ft lengths which were cut almost through at the appopriate length for 36 exposures. At each juncture the leader was properly cut and attached to the appropriately cut tail of the previous length. No bulk loader was needed, or available.
I used an immense amount of these films in high school.