Fred, with all due respect; at this point, even though this thread has carried on longer than most, (with a fair degree of interest based on the number of views) it appears that there are probably way less than a dozen or so of us who have an interest in "doing" anything with these rifles. Unfortunately we also seem to be widely scattered by geography.
BY far the biggest percentage of the surviving samples are in the hands of collectors who will probably never consider firing them and many of whom
probably look on those of us who would like to have that experience as Philistines and Vandals of the worst breed.
I am in serious doubt that there would ever be enough valid interest to justify even attempting to amend the ASSRA constitution and bylaws to permit using these pre-cartridge schuetzen rifles in any sort of official match. I think that attempting to do so would prove to be more divisive than beneficial and at this point I, personally, would not advocate such an action.
If there were enough folk interested I imagine that there might possibly be some way of creating a special, unofficial "side match" for educational or experimental purposes. however at this stage I think it is a moot argument.
so far I have failed to find any information regarding the participation of the M/L Percussion schuetzen rifles in NMLRA events either. however I have not given up completely---yet.