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<blockquote data-quote="codym" data-source="post: 1594023" data-attributes="member: 105909"><p>I wanted to end this thread with my findings and some observations. After lots of measurements, there was some variation in the head space between the nosler 280 AI brass and my fire-formed 280 rem brass. It was further exacerbated by the use of the wrong shell holder for sammi 280 AI dies/brass and the wildcat 280 ackley chambered rifle. Since switching to the .014 corrected shell holder from Redding I have not had any issues with miss fires with GMM 210, GMM 215 or BR2 primers. </p><p></p><p></p><p></p><p>A couple interesting things I observed while doing load work up was the very consistent decrease in velocity the further I backed the bullet away from the lands. Obviously I knew this would happen but it was a perfect 10 FPS loss every 10 thou I moved the bullet away from the lands, all the load work up I have done before was never that consistent. I settled on 57.7 gn's h4831SC with 210 GMM primers and a 168 vld, half moa load at 2910 fps about 20 thou off the lands ( 2.745 cbto). It gave me a solid SD of 6 over 30 rounds and an ES of 18. I tried the BR 2's and got similar #'s. I pushed the VLD's up to 3k plus with ejector swipe but no heavy bolt lift, but the accuracy wasn't there. Today I decided to try out some GMM 215's with the same load listed above. I was getting an average of 2930 fps with an ES of 9 and SD of 30 for 15 rounds. I was really surprised to see the primer give me a 20 FPS velocity jump. All rounds measured with a labrador. Anyway I'm happy with where I ended up with this rifle and I appreciate all those that offered suggestions.</p></blockquote><p></p>
[QUOTE="codym, post: 1594023, member: 105909"] I wanted to end this thread with my findings and some observations. After lots of measurements, there was some variation in the head space between the nosler 280 AI brass and my fire-formed 280 rem brass. It was further exacerbated by the use of the wrong shell holder for sammi 280 AI dies/brass and the wildcat 280 ackley chambered rifle. Since switching to the .014 corrected shell holder from Redding I have not had any issues with miss fires with GMM 210, GMM 215 or BR2 primers. A couple interesting things I observed while doing load work up was the very consistent decrease in velocity the further I backed the bullet away from the lands. Obviously I knew this would happen but it was a perfect 10 FPS loss every 10 thou I moved the bullet away from the lands, all the load work up I have done before was never that consistent. I settled on 57.7 gn's h4831SC with 210 GMM primers and a 168 vld, half moa load at 2910 fps about 20 thou off the lands ( 2.745 cbto). It gave me a solid SD of 6 over 30 rounds and an ES of 18. I tried the BR 2's and got similar #'s. I pushed the VLD's up to 3k plus with ejector swipe but no heavy bolt lift, but the accuracy wasn't there. Today I decided to try out some GMM 215's with the same load listed above. I was getting an average of 2930 fps with an ES of 9 and SD of 30 for 15 rounds. I was really surprised to see the primer give me a 20 FPS velocity jump. All rounds measured with a labrador. Anyway I'm happy with where I ended up with this rifle and I appreciate all those that offered suggestions. [/QUOTE]
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