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Rifles, Reloading, Optics, Equipment
7mm STW
195 Bergers and Vihtavuroi N570
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<blockquote data-quote="StaMic006" data-source="post: 1126218" data-attributes="member: 87513"><p>Ok so I need some help now. I have worked loads all the way up to 85 grains of VVN570 with no pressure signs but the best accuracy was around 82.5 grains. (All of these loads were loaded to Mag length) The grouping was not great so I figured I'd do the Berger seating depth test. Loaded up 24 rounds per the directions and started with the shortest COAL. I figured I'd start with more jump than less in case there was a pressure spike. Glad I did. The first round was fine. the next round had a pretty stout bolt lift. Against my better judgement I decided to fire one more and it blew the primer out. Why such a pressure spike when I decreased the charge and loaded the bullet longer? I was shooting 0.13 off the lands. I'm guessing that I need more jump?? I thought that with the bullets being loaded longer the pressure would be reduced even at the same charge....</p></blockquote><p></p>
[QUOTE="StaMic006, post: 1126218, member: 87513"] Ok so I need some help now. I have worked loads all the way up to 85 grains of VVN570 with no pressure signs but the best accuracy was around 82.5 grains. (All of these loads were loaded to Mag length) The grouping was not great so I figured I'd do the Berger seating depth test. Loaded up 24 rounds per the directions and started with the shortest COAL. I figured I'd start with more jump than less in case there was a pressure spike. Glad I did. The first round was fine. the next round had a pretty stout bolt lift. Against my better judgement I decided to fire one more and it blew the primer out. Why such a pressure spike when I decreased the charge and loaded the bullet longer? I was shooting 0.13 off the lands. I'm guessing that I need more jump?? I thought that with the bullets being loaded longer the pressure would be reduced even at the same charge.... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
7mm STW
195 Bergers and Vihtavuroi N570
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