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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
308 win and the berger 215
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<blockquote data-quote="Canadian Bushman" data-source="post: 878230" data-attributes="member: 41122"><p>Broz,</p><p> Ive been doing some research on what you stated about three groove barrels and ive found exactly what youve said to be true. I do see the majority of people having trouble with bullets coming apart were using small calibers, (.223, .25, .243 ) and were pushing them extremely fast. There were a few accounts of 30 cal bullets having trouble but they were in chamberings much larger that the 308. </p><p>Ive decided to proceed with the three groove, mainly because i like the idea of the non opposing grooves, hopefully i don't regret it. </p><p></p><p></p><p></p><p>Ive just finished doing some preliminary load development to help me finalize chambering dimensions for the new barrel. I thought i would share.</p><p></p><p>The gun is a factory remington 700 sps varmint, with a 26" 1:12 barrel.</p><p>It was sporting a nightforce nxs 5.5 - 22.</p><p>All shots were fired at 100yds with the chronograph placed 12-15' in front of the barrel. </p><p>I was using an alpha chrony which typically reads a little fast. </p><p>My current load shoots 2570-2590 (inferred through drops) and chrono typ reads 2585-2605.</p><p></p><p>I also weighed each case to account for early pressure signs</p><p></p><p>Results were as follows. </p><p></p><p>75 deg 29,94in/hg 91%hum 61ft elev.</p><p>.308 winchester, winchester brass 3x firings -NS only.</p><p>Reloader 17</p><p>215 berger hybrid</p><p>CCI #200 Primer</p><p>C.O.A.L 3.140 - .005" off the lands</p><p></p><p>Case weight Charge weight Velocity</p><p>157.7 gn 44 gn 2401</p><p>160.1 gn 45 gn 2440</p><p>163.3 gn 46 gn 2519 slightly flattened primer</p><p>165.3 gn 46.5 gn 2548</p><p>165.4 gn 47 gn 2575</p><p>152.5 gn 47 gn 2573</p><p>155.0 gn 47 gn 2575 slightly flattened primer</p><p>157.8 gn 47 gn 2572 flattened primer</p><p>157.8 gn 47.5 gn 2577 slightly flattened primer</p><p>160.0 gn 47.5 gn 2590</p><p>160.0 gn 47.5 gn 2591</p><p>158.7 gn 48 gn 1035 err slightly flattened primer</p><p>158.8 gn 48 gn dead primer</p><p>158.5 gn 48 gn 2611 flattened primer</p><p>158.6 gn 48.5 gn 2675 flattened primer</p><p>158.1 gn 48.5 gn 2646 flattened primer</p><p>158.2 gn 48.5 gn 2634 slightly flattened w/ ejec mark</p><p>158.0 gn 49 gn 2675 slightly flattened primer</p><p>158.0 gn 49 gn 2656 slightly flattened primer</p><p></p><p>Notes</p><p>47 gn produced good E.S. with bad accuracy. aprx 2" groups</p><p></p><p>47.5 gn produced slightly erratic E.S. with decent accuracy. aprx 1" groups</p><p></p><p>48 - 48.5 was slightly compressed load that maintained 1" accuracy but seemed to produce slightly more erratic velocity's. 48 gn - A charge weight that deems inconclusive because of bad primer and chrono error. Load may be worth revisiting.</p><p></p><p>Case with flattened primer and ejector mark was marked having a loose primer before firing, ejector marks could of gone unnoticed and been from previous firings.</p><p></p><p>48.5 - 49 may of yielded slightly heavier bolt lift, but minimal at best and hardly noticeable. No other signs of excessive pressure. </p><p>49gn was a compressed load.</p><p></p><p>Shots were carried out in strings of 6 shots and barrel heat was quite pleasant and not considered excessive. </p><p></p><p>I think accuracy would be better with a barrel with the correct twist as these bullets are quite long. </p><p></p><p>Recoil was increased from my 185gn loads but still very manageable with my 16lb gun. </p><p></p><p>I wanna extend a very gracious thank you to Montana Marine for sharing his data with me and helping me understand what i need to look for while carrying out this small test. From what i remember our results were pretty similar. Im really looking forward to getting this new barrel and going a bit more in depth.</p></blockquote><p></p>
[QUOTE="Canadian Bushman, post: 878230, member: 41122"] Broz, Ive been doing some research on what you stated about three groove barrels and ive found exactly what youve said to be true. I do see the majority of people having trouble with bullets coming apart were using small calibers, (.223, .25, .243 ) and were pushing them extremely fast. There were a few accounts of 30 cal bullets having trouble but they were in chamberings much larger that the 308. Ive decided to proceed with the three groove, mainly because i like the idea of the non opposing grooves, hopefully i don't regret it. Ive just finished doing some preliminary load development to help me finalize chambering dimensions for the new barrel. I thought i would share. The gun is a factory remington 700 sps varmint, with a 26" 1:12 barrel. It was sporting a nightforce nxs 5.5 - 22. All shots were fired at 100yds with the chronograph placed 12-15' in front of the barrel. I was using an alpha chrony which typically reads a little fast. My current load shoots 2570-2590 (inferred through drops) and chrono typ reads 2585-2605. I also weighed each case to account for early pressure signs Results were as follows. 75 deg 29,94in/hg 91%hum 61ft elev. .308 winchester, winchester brass 3x firings -NS only. Reloader 17 215 berger hybrid CCI #200 Primer C.O.A.L 3.140 - .005" off the lands Case weight Charge weight Velocity 157.7 gn 44 gn 2401 160.1 gn 45 gn 2440 163.3 gn 46 gn 2519 slightly flattened primer 165.3 gn 46.5 gn 2548 165.4 gn 47 gn 2575 152.5 gn 47 gn 2573 155.0 gn 47 gn 2575 slightly flattened primer 157.8 gn 47 gn 2572 flattened primer 157.8 gn 47.5 gn 2577 slightly flattened primer 160.0 gn 47.5 gn 2590 160.0 gn 47.5 gn 2591 158.7 gn 48 gn 1035 err slightly flattened primer 158.8 gn 48 gn dead primer 158.5 gn 48 gn 2611 flattened primer 158.6 gn 48.5 gn 2675 flattened primer 158.1 gn 48.5 gn 2646 flattened primer 158.2 gn 48.5 gn 2634 slightly flattened w/ ejec mark 158.0 gn 49 gn 2675 slightly flattened primer 158.0 gn 49 gn 2656 slightly flattened primer Notes 47 gn produced good E.S. with bad accuracy. aprx 2" groups 47.5 gn produced slightly erratic E.S. with decent accuracy. aprx 1" groups 48 - 48.5 was slightly compressed load that maintained 1" accuracy but seemed to produce slightly more erratic velocity's. 48 gn - A charge weight that deems inconclusive because of bad primer and chrono error. Load may be worth revisiting. Case with flattened primer and ejector mark was marked having a loose primer before firing, ejector marks could of gone unnoticed and been from previous firings. 48.5 - 49 may of yielded slightly heavier bolt lift, but minimal at best and hardly noticeable. No other signs of excessive pressure. 49gn was a compressed load. Shots were carried out in strings of 6 shots and barrel heat was quite pleasant and not considered excessive. I think accuracy would be better with a barrel with the correct twist as these bullets are quite long. Recoil was increased from my 185gn loads but still very manageable with my 16lb gun. I wanna extend a very gracious thank you to Montana Marine for sharing his data with me and helping me understand what i need to look for while carrying out this small test. From what i remember our results were pretty similar. Im really looking forward to getting this new barrel and going a bit more in depth. [/QUOTE]
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308 win and the berger 215
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