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Rifles, Reloading, Optics, Equipment
Reloading
Need help with ES/SD spread
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<blockquote data-quote="brguide" data-source="post: 991216" data-attributes="member: 72307"><p>Okay guys. I have been reloading like bench rest guys. I have 2 custom built 6.5 Creedmoors. Both shoot under .25 at 100 yards and under .75 at 300 yards. I am VERY ANAL about reloading. I have spent thousands of dollars on the best of the best. My first CM can produce .25 or less groups at any yardage and has an ES of 10 and a SD of 3. I anneal after every firing, I use bushing dies, I ream primer pockets, I use Nosler cases, CCI-BR2 primers, H4350, and Berger VLD. I do not have any problem in my first build has a Shilen 6 groove 1:8 twist. My second rifle has a 4 groove ratchet 1:8 twist and this is the rifle I am having es/sd problems with.</p><p></p><p>I can shoot 1 hole groups with this gun have done the ocw test, seating depth test, ect. I found a great grouping load BUT my ES/SD starts out at 95 fps and ends up usually at 30 fps. But I can produce .75" groups at 300 yards. I have a V1 and V2 magnetospeed chrono. I have noticed a few things that may be the problem</p><p></p><p>1) Some of my primer pockets still feel really new I use the 21st centry primer to seat them. I usually go by feel and all primer pocket are reamed to .130 EVERY SINGLE ONE. but when I check the depth of the seated primer some are .003, .005, .0065. Could this be the problem?</p><p></p><p>2) Maybe I could have a bad batch of primers?</p><p></p><p>Could someone please tell me what would do this? I have tried 41.5, 41.6, 41.7, 41.8, 41.9, 42.0, 42.1, 42.2, 42.3. I use 42.0 because it is the best. Ocationally I get ES of 10 over 10 shots and I did not change anything. The next round could be 50 fps slower than normal and then even out again for 2 rounds then the next round be 40 fps faster than normal. What the heck is causing this? Only this I could think was maybe the primer are not seated all the way. I loaded up 10 round and made sure I set my priming tool so no matter what they all measure now .0065 depth.</p><p></p><p>Next question:</p><p></p><p>Why is it when I go out in the morning 27.00 station pressure, 48% humidity, 70 degrees i get velocities of 2788 fps but when I go out at 1:00 pm 27.00 station p, 48% humidity, 92 degrees i get 2830 fps? I have tested H4350 5 rounds in a plastic bag on ice and 5 rounds in the sun and got the same speed 2788? I am not letting them sit in the chamber too long either.</p><p></p><p>I have done over 2000 rounds of load development and testing total to numerous guns but this gun is the only one that is throwing the ES & SD crazy. I have never seen this. The last part different speeds at different times happens to every gun I have tested.</p><p></p><p>Here is a picture of 2 separate groups I can shoot these all day long.</p></blockquote><p></p>
[QUOTE="brguide, post: 991216, member: 72307"] Okay guys. I have been reloading like bench rest guys. I have 2 custom built 6.5 Creedmoors. Both shoot under .25 at 100 yards and under .75 at 300 yards. I am VERY ANAL about reloading. I have spent thousands of dollars on the best of the best. My first CM can produce .25 or less groups at any yardage and has an ES of 10 and a SD of 3. I anneal after every firing, I use bushing dies, I ream primer pockets, I use Nosler cases, CCI-BR2 primers, H4350, and Berger VLD. I do not have any problem in my first build has a Shilen 6 groove 1:8 twist. My second rifle has a 4 groove ratchet 1:8 twist and this is the rifle I am having es/sd problems with. I can shoot 1 hole groups with this gun have done the ocw test, seating depth test, ect. I found a great grouping load BUT my ES/SD starts out at 95 fps and ends up usually at 30 fps. But I can produce .75" groups at 300 yards. I have a V1 and V2 magnetospeed chrono. I have noticed a few things that may be the problem 1) Some of my primer pockets still feel really new I use the 21st centry primer to seat them. I usually go by feel and all primer pocket are reamed to .130 EVERY SINGLE ONE. but when I check the depth of the seated primer some are .003, .005, .0065. Could this be the problem? 2) Maybe I could have a bad batch of primers? Could someone please tell me what would do this? I have tried 41.5, 41.6, 41.7, 41.8, 41.9, 42.0, 42.1, 42.2, 42.3. I use 42.0 because it is the best. Ocationally I get ES of 10 over 10 shots and I did not change anything. The next round could be 50 fps slower than normal and then even out again for 2 rounds then the next round be 40 fps faster than normal. What the heck is causing this? Only this I could think was maybe the primer are not seated all the way. I loaded up 10 round and made sure I set my priming tool so no matter what they all measure now .0065 depth. Next question: Why is it when I go out in the morning 27.00 station pressure, 48% humidity, 70 degrees i get velocities of 2788 fps but when I go out at 1:00 pm 27.00 station p, 48% humidity, 92 degrees i get 2830 fps? I have tested H4350 5 rounds in a plastic bag on ice and 5 rounds in the sun and got the same speed 2788? I am not letting them sit in the chamber too long either. I have done over 2000 rounds of load development and testing total to numerous guns but this gun is the only one that is throwing the ES & SD crazy. I have never seen this. The last part different speeds at different times happens to every gun I have tested. Here is a picture of 2 separate groups I can shoot these all day long. [/QUOTE]
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Need help with ES/SD spread
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