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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How do I get the BC for a bullet whos maker dosent even know????
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<blockquote data-quote="Ridge Runner" data-source="post: 278094" data-attributes="member: 951"><p>of all the bullets I have shot, only one has been right on as far as my actual BC compared to what the maker claimed.</p><p> Now, As long as you have everything else right in your program, (MV, scope height, ect) and you have your current conditions right, enter everything into your program. I zero at 300 yards, then shoot at 400, 500, and 600 yards and measure my actual drops. I then check my chart almost always I'm dropping less than the program says I will, I then start changing the BC in my program till my chart matches what I'm actualy shooting.</p><p> Then I adjust for 600 yards, confirm zero and shoot at 700, and 800 and confirm my drops, may do it again and make sure and possibly tweak the BC a lil more, then I'm done, thats the BC I enter for that bullet in my conditions.</p><p> Now here are my results</p><p> In my 7mm AM I shoot a 160 gr accubond at 3575 fps, nosler claims a BC of .531, I've been running this bullet out as far as 1350 yards using a BC of .62 and POI is dead on POA near as I can tell.</p><p> In my 6.5 Gibbs I shoot a 140 berger VLD at 3240 fps, published BC of .64, POI matches POA out to 1060 yards using a BC of .7</p><p> Have no idea if this is right but it works very well for me.</p><p>RR</p></blockquote><p></p>
[QUOTE="Ridge Runner, post: 278094, member: 951"] of all the bullets I have shot, only one has been right on as far as my actual BC compared to what the maker claimed. Now, As long as you have everything else right in your program, (MV, scope height, ect) and you have your current conditions right, enter everything into your program. I zero at 300 yards, then shoot at 400, 500, and 600 yards and measure my actual drops. I then check my chart almost always I'm dropping less than the program says I will, I then start changing the BC in my program till my chart matches what I'm actualy shooting. Then I adjust for 600 yards, confirm zero and shoot at 700, and 800 and confirm my drops, may do it again and make sure and possibly tweak the BC a lil more, then I'm done, thats the BC I enter for that bullet in my conditions. Now here are my results In my 7mm AM I shoot a 160 gr accubond at 3575 fps, nosler claims a BC of .531, I've been running this bullet out as far as 1350 yards using a BC of .62 and POI is dead on POA near as I can tell. In my 6.5 Gibbs I shoot a 140 berger VLD at 3240 fps, published BC of .64, POI matches POA out to 1060 yards using a BC of .7 Have no idea if this is right but it works very well for me. RR [/QUOTE]
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How do I get the BC for a bullet whos maker dosent even know????
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