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Neale - I have some data in the old Speer #8 manual for the 6.5 x 57 Mauser also known as the 6.5mmx.257 Roberts. There are minor differences in the case shape to the one given in the Vihtavuori manual's 6.5x57 for some reason. They are close enough that data is interchangable,though. What weight bullets are you interested in? 87gr. @ up to 3,334fps 100gr. @ up to 3,060fps 120gr. @ up to 2,889fps 140gr. @ up to 2,666fps Judging by the velocities given, I suspect these aren't loaded to 57,000psi. Incidently, the data from the Speer manual was developed in a BRNO Mauser rifle. If you want, e-mail me for the data. dtsapergia@shaw.ca I'll photograph it and mail it back by return mail. If you have access to Vit. powders, I'll send it as well. Oh - just checked the Hornady manual has it as well - all IMR powders, so it should be available on their web site. According to the mannual, they ran 160gr. RN's to 2,800fps. That means that speed was within pressure limits and still gave good accuracy. They stopped 140's at 2,700fps and 129's at 2,800, with 95gr. and 100's at 3,100fps. |