Paul,
As Mike stated it does not exist, you could ask this same question at Benchrest Central on the rimfire forum. Someone will chime in. I might even have a couple of their targets.
Sorry that you folks can't shoot N50 and are struggling at 25m.
Maybe consider starting your own organization for 25 yards, with easier target, just a thought.
Joe
Joe... I detect a little salt in the serving... Don't read something into it the isn't there... Extreme accuracy is just that, extreme accuracy... Fliers that we experience with the worlds best pellets from the worlds best rifles, happen somewhere between 25 and 50... therefore luck wins at 50, accuracy wins at 25. I'm not looking for an easier target.... In fact I've shot that BR-50 (as well as the IR 50-50, USRB, and IBS 50) target years ago with rimfire... It isn't easier than USARB. I'm asking about another Organization that is more dedicated to 25 meter or yard air rifle and shooters. We can shoot N-50 and have shot N-50... when given the choice 25 wins in shooter numbers... When we schedule 50, the shooters just don't show up.
Adverse to that is the 100 yard BR ( I would more consider them like NRA high-power possibly F class ) crowd, miraculously they get more shooters, of a different breed, not the same accuracy, not the same gun, but lots of shooters that only get to shoot 1 target at 100, some would rather we shoot Hail Maries at 300. they show up just on time, minimal extra equipment, rifle, slugs, bipod, and leave as fast as targets are scored and head to the local watering hole to chat. A far cry from the regimented benchrest aggregate shooting. Some want relay one so they can get to the bar first, others seem like they left home moments ago to get here and the sprinkler is still on and needs to be shut off as soon as they get home. Scores are written down and compared but never really submitted anywhere and everyone has a blast for the hour that it took out of their month. It's a different breed. Not that it's wrong, it's just not my type of right. And I see locally 50 yards being a similar thing. The rifles we use here are either built for 25, or built for varmint shooting at much more distance with a lesser regard to BR accuracy.