Omid,, This has been my experience with Vihta's published loads in different cartridges and with different powders. Last time, a mid range charge, according to their data, produced 230 fps below their estimation and a soothed case due to insuficient pressure which failed to expand the brass and seal the chamber.
Interesting! So their charge values may be inaccurate. Only a few reloading manuals cover 8X68S (e.g. Norma, Hornady and Lapua) so I have to compare their suggested charges to see where I am with the current charges. Previously I used N560 and went as high as 3000 f/s with Naturalis bullets but I could not get a tight group. This could have been related to my scope mount or the pressure point on the barrel (which I subsequently fixed). So I might repeat those loads again.
