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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Drag Function question.
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<blockquote data-quote="Jeff In TX" data-source="post: 32232" data-attributes="member: 1522"><p>The G1 drag model is usually only accuate out to 500 or 600 yards</p><p></p><p>The bigger issues I see on published BC's is using the proper drag model to match the type of bullet you're shooting. Bullet manufactures are in business to sell more bullets. A lot of shooters buy bullets based on high BC numbers. Bullet manufactures publish their bullets using the G1 drag model. G1 drag model yields higher BC's numbers, but are very inaccurate for determining exterior ballistic charts for long range shooting. </p><p></p><p>The G1 drag model is based on a 100+ year-old calculation using a 1 inch 1 pound round nose projectile as its basis. So what the bullet manufactures are really saying is…. any type of bullet regardless of shape can be calculated using the same mathematical model. So if I have a two bullets say a 325 grain .416 barnes X bullet with a published G1 BC of .470 and a 150 grain speer spitzer BT with a published G1 of .472, both leaving the muzzle at 2600 per second they are going to have the same aerodynamic flight characteristics out to a 1000 yards. I think not! </p><p></p><p>Those are the real issues I see when it comes to BC. Boat tail bullets us a G5 drag model and VLD bullets use a G7 drag model. Both drag models have a lower BC both totally different calculations for determining the bullets exterior ballistic tables.</p><p></p><p>OK Brent and Michael..... It's your turn! LOL</p></blockquote><p></p>
[QUOTE="Jeff In TX, post: 32232, member: 1522"] The G1 drag model is usually only accuate out to 500 or 600 yards The bigger issues I see on published BC’s is using the proper drag model to match the type of bullet you’re shooting. Bullet manufactures are in business to sell more bullets. A lot of shooters buy bullets based on high BC numbers. Bullet manufactures publish their bullets using the G1 drag model. G1 drag model yields higher BC’s numbers, but are very inaccurate for determining exterior ballistic charts for long range shooting. The G1 drag model is based on a 100+ year-old calculation using a 1 inch 1 pound round nose projectile as its basis. So what the bullet manufactures are really saying is…. any type of bullet regardless of shape can be calculated using the same mathematical model. So if I have a two bullets say a 325 grain .416 barnes X bullet with a published G1 BC of .470 and a 150 grain speer spitzer BT with a published G1 of .472, both leaving the muzzle at 2600 per second they are going to have the same aerodynamic flight characteristics out to a 1000 yards. I think not! Those are the real issues I see when it comes to BC. Boat tail bullets us a G5 drag model and VLD bullets use a G7 drag model. Both drag models have a lower BC both totally different calculations for determining the bullets exterior ballistic tables. OK Brent and Michael..... It's your turn! LOL [/QUOTE]
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