As Jim Watson said above.
Most, if not all of the old case forming and loading equipment was lost during the early days of WWI & again in WWII.
It was not a rumor either.
Entire ammo and arms factory's were cleared of old equipment to make room (and steel) to tool up for full tilt boogie war production of arms & ammo for the war effort.
Nobody was fighting with .25 RF Stevens, so the production lines were turned around, and the equipment scrapped.
To be replaced with new lines & machines making 30-06, .50 BMG, and .45 ACP, among other things!
Never to return again.
After WWI and WWII ended suddenly?
The ammo companies are nearly bankrupted after the military contracts are suddenly canceled and they were left holding the bag with 50,000 employees, huge facilities, and no customers for what they were making.
Old machines were sold for scrap to help pay the insurmountable bills.
It's all gone.
And replacing it now would be dollars no company could justify for the limited demand.
I think it could be done off shore in some third world country.
Maybe?
Old Western Scrounger got somebody to make some .41 RF for the old Remington Double-derringers years ago.
But it was loaded too hot and cracked the frames on some irreplaceable old derringers.
They learned a hard lesson rat there!!
Never to be tried again.
rc