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Hunting
The Basics, Starting Out
Bullet drop compensation dials (BDC dials)
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<blockquote data-quote="Bart B" data-source="post: 109155" data-attributes="member: 5302"><p>[ QUOTE ]</p><p>... this thread should highlight the importance of people actually measuring what their scope is regardless of what is stamped on the turrets. Apparently not many do that. Just a small amount of error can add up after 80, 100+ clicks....</p><p></p><p>[/ QUOTE ]Amidst the process of tightening the lid on this can of wiggly worms, I got some feedback from Exbal and Sierra Bullets.</p><p></p><p>Exbal e-mailed me a short paragraph explaining that one trig MOA equals 1.0472.... inches at 100 yards. Yes, that's all they said; even when I mentioned that in my e-mail to them. No mention at all of my comments about iron (aperture) sight and the 7.2-inch base separation standard for externally adjusted scopes.</p><p></p><p>Sierra Bullets, on the other hand, did better. They reasoned that maybe the two guys behind their ballistics stuff had engineering backgrounds and maybe they made a bit of a mistake using trig MOA (TMOA) instead of the shooting MOA (SMOA) I mentioned. But these two were high-end engineering rocket scientists so they were used to dealing with standard angular units and all the trig functions related to them. But Sierra also made no comments about the base spacing standard for externally adjusted scopes.</p><p></p><p>'Twas suggested this thread end and a related one be put on the Bullets, Barrels &amp; Ballistics section, but I think the one for Scopes &amp; Optics would be better. That's the one related to sighting equipment where this thread's info fits into. I'm trying to think of a decent title.... should get one soon....</p></blockquote><p></p>
[QUOTE="Bart B, post: 109155, member: 5302"] [ QUOTE ] ... this thread should highlight the importance of people actually measuring what their scope is regardless of what is stamped on the turrets. Apparently not many do that. Just a small amount of error can add up after 80, 100+ clicks.... [/ QUOTE ]Amidst the process of tightening the lid on this can of wiggly worms, I got some feedback from Exbal and Sierra Bullets. Exbal e-mailed me a short paragraph explaining that one trig MOA equals 1.0472.... inches at 100 yards. Yes, that's all they said; even when I mentioned that in my e-mail to them. No mention at all of my comments about iron (aperture) sight and the 7.2-inch base separation standard for externally adjusted scopes. Sierra Bullets, on the other hand, did better. They reasoned that maybe the two guys behind their ballistics stuff had engineering backgrounds and maybe they made a bit of a mistake using trig MOA (TMOA) instead of the shooting MOA (SMOA) I mentioned. But these two were high-end engineering rocket scientists so they were used to dealing with standard angular units and all the trig functions related to them. But Sierra also made no comments about the base spacing standard for externally adjusted scopes. 'Twas suggested this thread end and a related one be put on the Bullets, Barrels & Ballistics section, but I think the one for Scopes & Optics would be better. That's the one related to sighting equipment where this thread's info fits into. I'm trying to think of a decent title.... should get one soon.... [/QUOTE]
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The Basics, Starting Out
Bullet drop compensation dials (BDC dials)
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