RWS produces boxer primer in LR,LRM like any of the four major American primer mfg's,the standard LR prime is the same as any of the American standard LR primers. All LR primers even CCI,Fed,Win,Rem will all produce different pressures with the same load data although it may be small,just reduce your load by 10% with a know primer and load you have been using and work you load back up.