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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What the heck is goin on?
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<blockquote data-quote="Mysticplayer" data-source="post: 80763" data-attributes="member: 8947"><p>Nope don't live anywhere Eastern USA. About as far west in CANADA as can get without getting wet. So no, I do not BS and have no agenda except sharing experiences through burning powder. I think they refer to that as real world experience.</p><p></p><p>I wonder what Eastern American agenda might be anyways? Want to elaborate????</p><p></p><p>Speaking of which, I went out and reshot my drop chart as I do just to make sure everything is right for hunting season.</p><p></p><p>Using the data generated by the JBM software, my drops at 5 distances were within 1 click (furthest one was off by 1 click) of predicted data. Ranges were verified using a Leica 800 rangefinder on a beautiful clear and windless day.</p><p></p><p>Here are the come ups: 375yds 4min, 550yds 7.5min, 650yds 9.5min, 750yds 12.0min, 950yds 17min (predicted was 16.75min). Muzzle velocity is 3150fps. 7Rem Mag with moly 162gr Amax. Rifle Savage 110 w/brake (I like to spot my impacts). Scope my trusty Elite 4200 6X24 w/ mil dot.</p><p></p><p>Just input my data G7 drag function. 0.625 BC and voila. That's the drop table that comes out. Pretty flat....</p><p></p><p>Now change to a G1 drag function and change the BC value until you get something close. I bet you laugh at what that value has to be. Try with the other 5 G functions and have some fun. You will quickly come to the same conclusions I did.</p><p></p><p>So when comparing BC's, ask which drag function was used in the calculation of that value. The number is not just the number after all.</p><p></p><p>I hope that the bullet industry will someday standardize the BC values vs G drag function (all flat base bullets use one G function, BT/VLD designs another or whatever) so that we can continue to compare apples to apples as we have been lead to believe all these years.</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 80763, member: 8947"] Nope don't live anywhere Eastern USA. About as far west in CANADA as can get without getting wet. So no, I do not BS and have no agenda except sharing experiences through burning powder. I think they refer to that as real world experience. I wonder what Eastern American agenda might be anyways? Want to elaborate???? Speaking of which, I went out and reshot my drop chart as I do just to make sure everything is right for hunting season. Using the data generated by the JBM software, my drops at 5 distances were within 1 click (furthest one was off by 1 click) of predicted data. Ranges were verified using a Leica 800 rangefinder on a beautiful clear and windless day. Here are the come ups: 375yds 4min, 550yds 7.5min, 650yds 9.5min, 750yds 12.0min, 950yds 17min (predicted was 16.75min). Muzzle velocity is 3150fps. 7Rem Mag with moly 162gr Amax. Rifle Savage 110 w/brake (I like to spot my impacts). Scope my trusty Elite 4200 6X24 w/ mil dot. Just input my data G7 drag function. 0.625 BC and voila. That's the drop table that comes out. Pretty flat.... Now change to a G1 drag function and change the BC value until you get something close. I bet you laugh at what that value has to be. Try with the other 5 G functions and have some fun. You will quickly come to the same conclusions I did. So when comparing BC's, ask which drag function was used in the calculation of that value. The number is not just the number after all. I hope that the bullet industry will someday standardize the BC values vs G drag function (all flat base bullets use one G function, BT/VLD designs another or whatever) so that we can continue to compare apples to apples as we have been lead to believe all these years. Jerry [/QUOTE]
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