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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
My Berger 7mm hybrid BC test
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<blockquote data-quote="elmerdeer" data-source="post: 416563" data-attributes="member: 7381"><p>Hi guys I bought some berger hybrids 180gr bullets with a G7 BC of .345 and I decided to run some tests on them at semi lomg range 625 yards to see if they would get that BC. I have a Hoover metplat trimmer and poining die, so I sort 150 bullets and there is .002" variance at the ogive, pretty good so far. I start to metplat trim them about .005" and then point them. So if theory is correct I should loose about 2% BC and gain lets say up to 8% BC, so were 5% gain on BC which would bring the BC of this bullet up to G7.362 BC. </p><p>Well I shot them out to 625 yards and was low about 1.5 MOA, so I come back look at my speeds from my chrono at 12ft and decide to put a chrono at 200 yards to see what speed I am getting out there. Then I run those numbers with my 2 average velocities and I come up with my ne BC for these 180gr hybrid Bergers and I am a little off Bergers numbers.</p><p>The BC I got was .327, so it seems they are not as high as I thought. </p><p>Has anyone seen the same thing with these bullets?</p><p>But as far as acurracy they are pretty good if I do my part and the conditions are good, i get Half MOA or less at 200yards. </p><p>And when I shot at 625yards the bullets went through a quarter inch of steel like it wasnt there. So I think it should be a good hunting bullet. I shoot a 7mm Dakota caliber, Stiller predator action, with a 24.5" Rock barrel 8.73 twist and my load is 74.5grs Retumbo seated .015" off the lands and I am getting 2979 fps avg with low es and sd numbers.</p><p>Let me know if what I did was the right, as I am pretty new to long range shooting.</p><p>Thanks </p><p>Elmer</p></blockquote><p></p>
[QUOTE="elmerdeer, post: 416563, member: 7381"] Hi guys I bought some berger hybrids 180gr bullets with a G7 BC of .345 and I decided to run some tests on them at semi lomg range 625 yards to see if they would get that BC. I have a Hoover metplat trimmer and poining die, so I sort 150 bullets and there is .002" variance at the ogive, pretty good so far. I start to metplat trim them about .005" and then point them. So if theory is correct I should loose about 2% BC and gain lets say up to 8% BC, so were 5% gain on BC which would bring the BC of this bullet up to G7.362 BC. Well I shot them out to 625 yards and was low about 1.5 MOA, so I come back look at my speeds from my chrono at 12ft and decide to put a chrono at 200 yards to see what speed I am getting out there. Then I run those numbers with my 2 average velocities and I come up with my ne BC for these 180gr hybrid Bergers and I am a little off Bergers numbers. The BC I got was .327, so it seems they are not as high as I thought. Has anyone seen the same thing with these bullets? But as far as acurracy they are pretty good if I do my part and the conditions are good, i get Half MOA or less at 200yards. And when I shot at 625yards the bullets went through a quarter inch of steel like it wasnt there. So I think it should be a good hunting bullet. I shoot a 7mm Dakota caliber, Stiller predator action, with a 24.5" Rock barrel 8.73 twist and my load is 74.5grs Retumbo seated .015" off the lands and I am getting 2979 fps avg with low es and sd numbers. Let me know if what I did was the right, as I am pretty new to long range shooting. Thanks Elmer [/QUOTE]
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My Berger 7mm hybrid BC test
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