Originally Posted By: fuhrmann

I haven┤t seen such detailed data in all my pre-WW I catalogs (Roth, DWM, Utendoerffer).
It seems those Czech or Slovak ammo factories continued loading the old BP cartridges after WW I, maybe even after WW II and started to measure decent ballistic data?

Yeah, me thinks the Czech folks are withholding valuable info or it may be that we haven't asked but they are mining data from somewhere. Remember S&B has been established for quite a few years and many times an Austrian or German weapons maker would cut a chamber to the whims of his client(Czech, Serb, whomever).