I shoot mostly 160gr TTSX bullets with either IMR3031 or H4895 in my 8X57. For 196gr Norma bullets Norma 203-B works well but I have a load for 220gr Sierra Game Kings using CFE223 and that is the powder I would try first for 196 and heavier bullets.Is there a "go to" powder for the 8x57 Mauser cartridge for the heavy (196 grain and heavier) bullets?