As most of us know firing a bullet through a barrel leaves a unique "fingerprint" from microscopic striations in the bore transferring to the bullet.
This enables experts to use a comparison microscope to match a sample bullet to an unknown bullet to determine if they were fired by the same gun.
By paper patching this paper jacket would seem to isolate the bullet from the bore and prevent the transfer of these striations.
Also as this paper jacket removes itself from the bullet upon exit from the muzzle (unlike a copper jacket) it also prevents comparison with any imprints.
I wonder if any homicides were committed with paper patched bullets?
Just a thought from a sleepless night.