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Rifles, Reloading, Optics, Equipment
7mm STW
195 Bergers and Vihtavuroi N570
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<blockquote data-quote="jweigel" data-source="post: 1216669" data-attributes="member: 72021"><p>Had great morning to shoot (Lefty....you should have been out). While I did not repeat the .3" group, I did have a 80 grains three shoot group with an ES of 3. The group was MOA. Nothing improved above or below. The speed stayed within 30 fps for a full grain of powder up from 80. At 81 grains I had a big POI shift 5 inches down. I am starting to wonder if after 8 shoots of so I get enough powder/copper fouling to cause the POI change. The speed at 81 was about the same as 80.</p><p></p><p>I love the ES and no change in speed over a spread of grains, I just which the group size was better. </p><p></p><p>I am thinking I need to shoot at 400 yards or more so see what group size is then. I am hoping (wishful thinking???) that MOA will stay or get better......bullet stabilizing with distance???</p><p></p><p>I am going to stay with 80 grains of N570. The speeds today were 3072, 3073 and 3070. </p><p></p><p>Just to test, I will load up three groups (3 shot groups) with a .010 increase and decrease in the seating depth over the .050 OTL I am at now.</p><p></p><p>jjw</p><p>ND</p></blockquote><p></p>
[QUOTE="jweigel, post: 1216669, member: 72021"] Had great morning to shoot (Lefty....you should have been out). While I did not repeat the .3" group, I did have a 80 grains three shoot group with an ES of 3. The group was MOA. Nothing improved above or below. The speed stayed within 30 fps for a full grain of powder up from 80. At 81 grains I had a big POI shift 5 inches down. I am starting to wonder if after 8 shoots of so I get enough powder/copper fouling to cause the POI change. The speed at 81 was about the same as 80. I love the ES and no change in speed over a spread of grains, I just which the group size was better. I am thinking I need to shoot at 400 yards or more so see what group size is then. I am hoping (wishful thinking???) that MOA will stay or get better......bullet stabilizing with distance??? I am going to stay with 80 grains of N570. The speeds today were 3072, 3073 and 3070. Just to test, I will load up three groups (3 shot groups) with a .010 increase and decrease in the seating depth over the .050 OTL I am at now. jjw ND [/QUOTE]
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Rifles, Reloading, Optics, Equipment
7mm STW
195 Bergers and Vihtavuroi N570
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