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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
how much does molly change the B.C of a bullet
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<blockquote data-quote="Varmint Hunter" data-source="post: 35329" data-attributes="member: 313"><p>Hera is an excerpt from a piece written by Dan Hackett. He is a regular poster at xtremeaccuracy.com</p><p></p><p></p><p>As the only person I know of who has published articles about trajectories becoming flatter with moly-coated bullets, I think I can say I know something about the topic. First, I do not merely claim a reduction in bullet drop; I report it as a matter of objective fact. This is a real phenomenon. It is not something I thought I noticed while shooting offhand at a rock on the far side of some canyon. It is an occurrence I have repeatedly observed, measured, verified, duplicated and recorded with at least as much care as Mr. Vaughn reports using anywhere in his book, including tests I have performed with 6mm benchrest bullets similar to the ones he employed.</p><p></p><p> Second, a flattening of trajectory implies an increase in ballistic coefficient only if one assumes that moly-coated bullets fit the same ballistic model as uncoated ones. During their passage through a rifle barrel, moly bullets undergo considerably less deformation of their overall shape and of the jacket surfaces which contact the bore. There is no good reason to doubt out of hand that these changes will affect airflow over the bullet, and it is possible they could change the relationship between drop and velocity loss on which standard Ingalls-style ballistic computations depend for their accuracy, without significant alteration of the drag acting to slow the bullet. It should be remembered that a variety of different drag models exist to account for various projectile shapes, but sporting bullets are all lumped into a single model for the simple (if rather lame) reason that they don't usually fit any of the other models. We can't assume that the flight of every bullet from handgun semi-wadcutter to needle-pointed VLD can be portrayed with complete accuracy in every aspect, based on the size of a single variable such as ballistic coefficient. Nor can we assume without adequate testing that the shape- and surface differences that are readily observable between fired moly- and uncoated bullets will have no effect on the shape of the trajectory curve.</p></blockquote><p></p>
[QUOTE="Varmint Hunter, post: 35329, member: 313"] Hera is an excerpt from a piece written by Dan Hackett. He is a regular poster at xtremeaccuracy.com As the only person I know of who has published articles about trajectories becoming flatter with moly-coated bullets, I think I can say I know something about the topic. First, I do not merely claim a reduction in bullet drop; I report it as a matter of objective fact. This is a real phenomenon. It is not something I thought I noticed while shooting offhand at a rock on the far side of some canyon. It is an occurrence I have repeatedly observed, measured, verified, duplicated and recorded with at least as much care as Mr. Vaughn reports using anywhere in his book, including tests I have performed with 6mm benchrest bullets similar to the ones he employed. Second, a flattening of trajectory implies an increase in ballistic coefficient only if one assumes that moly-coated bullets fit the same ballistic model as uncoated ones. During their passage through a rifle barrel, moly bullets undergo considerably less deformation of their overall shape and of the jacket surfaces which contact the bore. There is no good reason to doubt out of hand that these changes will affect airflow over the bullet, and it is possible they could change the relationship between drop and velocity loss on which standard Ingalls-style ballistic computations depend for their accuracy, without significant alteration of the drag acting to slow the bullet. It should be remembered that a variety of different drag models exist to account for various projectile shapes, but sporting bullets are all lumped into a single model for the simple (if rather lame) reason that they don’t usually fit any of the other models. We can’t assume that the flight of every bullet from handgun semi-wadcutter to needle-pointed VLD can be portrayed with complete accuracy in every aspect, based on the size of a single variable such as ballistic coefficient. Nor can we assume without adequate testing that the shape- and surface differences that are readily observable between fired moly- and uncoated bullets will have no effect on the shape of the trajectory curve. [/QUOTE]
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how much does molly change the B.C of a bullet
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