I should better make no more posts in this matter. Rel 22 and MRP are derivates of Bofors RP5NP. Norma makes it's own selection procedure, for Rel22 it is done by Alliant or Bofors, whatever you want. Meanwhile all these propellants are silently migrating to new Bofors NT-technology powders, keeping the old burning rates for the handloader. Thats all I can tell you because I don't want to be excluded from actual information from propellant manufacturers.
