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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help Needed with LB3.0 and .338 Bergers
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<blockquote data-quote="Broz" data-source="post: 397177" data-attributes="member: 7503"><p>Eaglet, all I can say is wow. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p> </p><p>I admire your tallent with numbers. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /></p><p> </p><p>Lets reflect a bit of recent history here. Your findigs make me recall the day or two I first spent with the Bergers and load development. My load that I used with the 300 SMK's of 92.5 gr of H-1000 was showing slight pressure with the Bergers. I backed it off 1 gr. as I am not a fan of hot loads. So I needed to find that new MV. </p><p> </p><p>I had heard that the Bergers were faster due to the less barring surface too. So first thing I did was plug all my info into exbal and then do a "Tragectory Validation" at 700 yards. My proven drops with exbal and the smk's used a MV of 2805, this load chronographed on my chrony either side of 2850. So ater the tragectory validation at 700 with the reduced charge and the bergers it was showing a MV in the low 2700's I don't rember exactly but like 2710 or so. </p><p> </p><p>I was troubled by this, how could 1 gr drop me 100 fps, people had stated the bergers were faster too. I had a hard time believing this. So I started asking questions and was quickly told my method of dropping MV was a poor practise. I agreed, and bought LB3.0 as I felt I was behind on technology with ballistic programs. I felt that my mv should be around 2770 or so (just my guess) this was before I chronoed. Then my chrono confirmed this. But obviously is wrong. </p><p> </p><p>Eagle as I was shooting yesterday at 700, 1042 and 1342, and recording drops. I also noted in my data what I felt was needed for corrections to the dial ups to be spot on at each distance. My recording were 700/10.8 , 1042/22.7 and 1342/34.7. So I am excited with your solution to my problem.</p><p> </p><p>As soon as I get through this cup of coffee, I will plug this info into LB and Exbal and see how it all works out. Then as soon as I can I will be out shooting again using LB to see how it all applies to real world shooting.</p><p> </p><p>I also am in search to find a Oehler to shoot my rifle through. I just need to see this.</p><p> </p><p>Right now I am back to my old belief that most all of us are being fooled by chronographs. I dont think we can spend $100, $200 or even $500 on a piece of equipment, to measure the speed of a projectile 1 1/2" long and traveling at a speed of 3000 fps. and expect this equpment to be accurate. How can something that cost only a few hundred dollars do this? Yet we undoubtingly rely on them. And even more so, we believe that when they say 5 or 10 measured projctiles fell into with in less than 10 FPS of each other, we believe it and are happy. I am not sure I buy this. Right now I think Eaglets method of finding MV is far more accurate than any chrono I have been around in my 40 years of shooting. I also believe that your 1000 yards group is the best test for ES.</p><p> </p><p>Thank You Eaglet and Bigngreen for your help here. I will send some more lead and report.</p><p> </p><p>Thanks!</p><p> </p><p>Jeff</p></blockquote><p></p>
[QUOTE="Broz, post: 397177, member: 7503"] Eaglet, all I can say is wow. :) I admire your tallent with numbers. :cool: Lets reflect a bit of recent history here. Your findigs make me recall the day or two I first spent with the Bergers and load development. My load that I used with the 300 SMK's of 92.5 gr of H-1000 was showing slight pressure with the Bergers. I backed it off 1 gr. as I am not a fan of hot loads. So I needed to find that new MV. I had heard that the Bergers were faster due to the less barring surface too. So first thing I did was plug all my info into exbal and then do a "Tragectory Validation" at 700 yards. My proven drops with exbal and the smk's used a MV of 2805, this load chronographed on my chrony either side of 2850. So ater the tragectory validation at 700 with the reduced charge and the bergers it was showing a MV in the low 2700's I don't rember exactly but like 2710 or so. I was troubled by this, how could 1 gr drop me 100 fps, people had stated the bergers were faster too. I had a hard time believing this. So I started asking questions and was quickly told my method of dropping MV was a poor practise. I agreed, and bought LB3.0 as I felt I was behind on technology with ballistic programs. I felt that my mv should be around 2770 or so (just my guess) this was before I chronoed. Then my chrono confirmed this. But obviously is wrong. Eagle as I was shooting yesterday at 700, 1042 and 1342, and recording drops. I also noted in my data what I felt was needed for corrections to the dial ups to be spot on at each distance. My recording were 700/10.8 , 1042/22.7 and 1342/34.7. So I am excited with your solution to my problem. As soon as I get through this cup of coffee, I will plug this info into LB and Exbal and see how it all works out. Then as soon as I can I will be out shooting again using LB to see how it all applies to real world shooting. I also am in search to find a Oehler to shoot my rifle through. I just need to see this. Right now I am back to my old belief that most all of us are being fooled by chronographs. I dont think we can spend $100, $200 or even $500 on a piece of equipment, to measure the speed of a projectile 1 1/2" long and traveling at a speed of 3000 fps. and expect this equpment to be accurate. How can something that cost only a few hundred dollars do this? Yet we undoubtingly rely on them. And even more so, we believe that when they say 5 or 10 measured projctiles fell into with in less than 10 FPS of each other, we believe it and are happy. I am not sure I buy this. Right now I think Eaglets method of finding MV is far more accurate than any chrono I have been around in my 40 years of shooting. I also believe that your 1000 yards group is the best test for ES. Thank You Eaglet and Bigngreen for your help here. I will send some more lead and report. Thanks! Jeff [/QUOTE]
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Help Needed with LB3.0 and .338 Bergers
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