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When things don't compute
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<blockquote data-quote="azsugarbear" data-source="post: 775901" data-attributes="member: 4809"><p>There are a lot of variables that impact your drop chart. 200+ fps change to make your ballistics calc work right makes me think that something else is going on here.</p><p></p><p>Are you sure about scope height? What bullet are you shooting? (Depending on mfg., they can fudge their BC's a fair amount). Another way to throw off you calculations is to be off slightly off on your zero. If you are zeroed at 100 yds, that probably means you are hitting close to center - but not exactly on center. Let's say we are 1/8" below center at 100 yds. With our .25 MOA scopes, one click up puts our group 1/8" above center, while one click down puts us 3/8" below center - so we call it good - even though our group is 1/8" below center at 100 yds. That's as close as we can get it. So we enter a 100 yd zero into our ballistics. When validating, we find our bullet drop is 2-3 clicks below what it should be at 800 yds. That's because our true zero was not 100 yds, but closer to 80 yds.</p><p></p><p>My guess is you have several contributing factors that are combining together to get you off by that many clicks. Berger & Sierra bullets are pretty close to their stated BC's, but other mfgs bullets can be overstated. Just some additional thoughts to throw into the stew pot.</p></blockquote><p></p>
[QUOTE="azsugarbear, post: 775901, member: 4809"] There are a lot of variables that impact your drop chart. 200+ fps change to make your ballistics calc work right makes me think that something else is going on here. Are you sure about scope height? What bullet are you shooting? (Depending on mfg., they can fudge their BC's a fair amount). Another way to throw off you calculations is to be off slightly off on your zero. If you are zeroed at 100 yds, that probably means you are hitting close to center - but not exactly on center. Let's say we are 1/8" below center at 100 yds. With our .25 MOA scopes, one click up puts our group 1/8" above center, while one click down puts us 3/8" below center - so we call it good - even though our group is 1/8" below center at 100 yds. That's as close as we can get it. So we enter a 100 yd zero into our ballistics. When validating, we find our bullet drop is 2-3 clicks below what it should be at 800 yds. That's because our true zero was not 100 yds, but closer to 80 yds. My guess is you have several contributing factors that are combining together to get you off by that many clicks. Berger & Sierra bullets are pretty close to their stated BC's, but other mfgs bullets can be overstated. Just some additional thoughts to throw into the stew pot. [/QUOTE]
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