You are only about 15 years too late. BR-50 died when it's creator, Larry Brown passed away.
I shot BR-50 for a number of years starting in 1989 till '96. It truly is "the meanest game on the earth".
Most shooters looked at the target and assumed it wasn't that difficult, then got a surprise when they finally understood "worst edge" scoring.
A number of off shoots started from BR-50 including IR 50-50 and ARA 50. The Professional Shooting League (PSL) has a match very similar, but only consisting of 25 shots per card.
When BR-50 was first conceived, there were 3 classes. Centerfire; shot @100 yds, rimfire; shot @50 yds and air rifle shot @25 yds.
The idea was to make all classes compatible with each other. Centerfire never caught on as not many bench rest shooters liked the idea of shooting 50 shots in a 30 minute period. Rimfire was the most popular. The air rifle class was usually small because it took a scuba gun to be competitive. I don't know why, but towards it's demise Larry Brown decided that rimfire was NOT an accurate discipline because of all the variables in ammo that the shooter had no control of, and therefore decided to ELIMINATE rimfire class. After promoting this for over 10 years, he made a lot of enemies. Shortly after this decision, he passed away from cancer.
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