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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Could someone explain bullet drop and BDC reticles to me?
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<blockquote data-quote="grey2112" data-source="post: 72302" data-attributes="member: 4320"><p>OK, I'm trying to understand a few things about bullet drop and reticles.</p><p></p><p>Let's say the average 55 grain FMJ bullet fired out of a 5.56 barrel (.223) 16" M-4 has the following bullet drop (this assumes sighting in at 100 yards):</p><p></p><p>-3.3" @ 200yds</p><p>-13" @ 300yds</p><p>-32" @ 400yds</p><p>-62" @ 500yds</p><p></p><p></p><p>Now, how much "hold over" is required at 100 yards to hit the target at 200, 300, 400, and 500 yards?</p><p></p><p>Surely you don't have to aim 62 inches higher from your 100 yard mark to hit at 500 yards, do you?</p><p></p><p>I recall looking at the Burris Ballistic Plex reticle chart here:</p><p></p><p></p><p><a href="http://www.burrisoptics.com/reticles.html" target="_blank">http://www.burrisoptics.com/reticles.html</a></p><p></p><p>At the bottom it shows the reticle with standard corrections at 100 yards of 1.5" at 200, 4.5" at 300, 7.5" at 400, and 11" at 500 yards.</p><p></p><p>Is this more in line with what you would need to do regarding holdover for a 55 grain FMJ bullet fired from a 16" M-4 barrel to be "spot on" at these various yardages?</p></blockquote><p></p>
[QUOTE="grey2112, post: 72302, member: 4320"] OK, I'm trying to understand a few things about bullet drop and reticles. Let's say the average 55 grain FMJ bullet fired out of a 5.56 barrel (.223) 16" M-4 has the following bullet drop (this assumes sighting in at 100 yards): -3.3" @ 200yds -13" @ 300yds -32" @ 400yds -62" @ 500yds Now, how much "hold over" is required at 100 yards to hit the target at 200, 300, 400, and 500 yards? Surely you don't have to aim 62 inches higher from your 100 yard mark to hit at 500 yards, do you? I recall looking at the Burris Ballistic Plex reticle chart here: [url="http://www.burrisoptics.com/reticles.html"]http://www.burrisoptics.com/reticles.html[/url] At the bottom it shows the reticle with standard corrections at 100 yards of 1.5" at 200, 4.5" at 300, 7.5" at 400, and 11" at 500 yards. Is this more in line with what you would need to do regarding holdover for a 55 grain FMJ bullet fired from a 16" M-4 barrel to be "spot on" at these various yardages? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Could someone explain bullet drop and BDC reticles to me?
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