I have some small Vs large primer info in 32/40 , using Federal 30 American cases. For the  large primer Win. John Wayne cases.   

32/40, BS, 28" barrel
205 GC, 34 gr AA2520, F210 & 205M

10 shot strings

Small, 2167, SD 10.6, ES 31

Large, 2180, SD 12.8, ES 29 

Not much differance.

Frank

Those BR2 primers are out of sight in price. Last I saw were $247/5K. Still, I'd like to try them when they're available again. I lucked up on finding the Federal 215 primers.

in the early rebirth of BP cartridges, Venturino and Garbe recommended Fed 215's because Goex was considered a difficult powder to ignite.  The quality and choice of Bp was very limited.  You had your choice of Goex, or Pyrodex if you could not get your hands on Goex.   
If you read equipment lists from the 1990's championships, nearly everyone used Goex and Federal 215's.  Just a few were using other primers, and only one I knew of was using pistol primers.
Other powders came into the market, such as Elephant, Swiss and Kik, the choices opened up. (Chances are Goex improved their quality a bit as well.)  This led to different experiments with primers, as the old, dirty hard to ignite Goex was no longer the only BP on the block.

Now the main goal is greater consistency from shot to shot, hence the move to things like Br2's, and the desire to ignite BP "gently" so the move to pistol primers.