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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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<blockquote data-quote="MontanaRifleman" data-source="post: 479711" data-attributes="member: 11717"><p><span style="color: black"><span style="font-family: 'Verdana'">For starters, that was another great shot BB! I really enjoy your videos. What camera are you using? Gives a pretty good view of 1K plus. Hopefully I can do some vids like that.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">OK, so I'm not sure what you're getting at here? Are you saying your rifle is changing the bullet's shape? Are you saying the G7 model is whacked out? I'm very interest in your claim that changing the G7 BC by 13% only changed the bullets POI very slightly. Is that observed or calculated? I would like to run the numbers if you could provide the inputs.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Have you ever recovered any of your bullets and measured their shanks and compared with unfired bullets? If they are the same, then your bullet hasn't changed shape... unless the nose is slumping... and then we have a whole other can of worms. That would definitely increase the bullets drag factor and almost assuredly cause stability and accuracy problems. If the bullet's nose is deforming, then it's being pushed beyond it's operational limits. A bullet is going to come out the muzzle of a rifle with the same diameter as the bore... period. The only shape change that can take place is at the nose and that would be a BAD thing... and I am guessing that bullet makers such as Bryan and Paul would be the first to agree. the bullet's nose was designed to give the best performance for that bullet.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Are you saying that a change of the bullet's shape resulting from being fired from a rifle actually enhances the bullet's ballistics?</span></span></p><p> </p><p> </p><p>[</p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Let me state my position clearly... I adamantly deny that a properly rifled rifle bore will change the shape of a bullet that is not being pushed beyond it's limitations. Therefore, since according to the physical laws of the universe, which can not be altered, the ballistic drag coefficient can not be changed from being fired from a rifle bore, since the bullet's drag coefficient is completely dependent upon it's shape and mass alone. any other "apparent" effects on the bullet such as coning, etc., are external factors and have nothing to do with the bullet's drag coefficient.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">If this is wrong, I would like to see proof. Over in the "other" thread, they have a whole list of things that might explain discrepancies between published and individually field tested BC's.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">In the mean time you have a system that works for and as I've already stated to Eddybo and whoever, that's great. Making the shot is what it's all about.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">As for me, I'll start with the best info available, which IMO is BL's G7's. If my actual results differ, and I can't figure out why, then I'll adjust accordingly.</span></span></p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 479711, member: 11717"] [COLOR=black][FONT=Verdana]For starters, that was another great shot BB! I really enjoy your videos. What camera are you using? Gives a pretty good view of 1K plus. Hopefully I can do some vids like that.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]OK, so I'm not sure what you're getting at here? Are you saying your rifle is changing the bullet's shape? Are you saying the G7 model is whacked out? I'm very interest in your claim that changing the G7 BC by 13% only changed the bullets POI very slightly. Is that observed or calculated? I would like to run the numbers if you could provide the inputs.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Have you ever recovered any of your bullets and measured their shanks and compared with unfired bullets? If they are the same, then your bullet hasn't changed shape... unless the nose is slumping... and then we have a whole other can of worms. That would definitely increase the bullets drag factor and almost assuredly cause stability and accuracy problems. If the bullet's nose is deforming, then it's being pushed beyond it's operational limits. A bullet is going to come out the muzzle of a rifle with the same diameter as the bore... period. The only shape change that can take place is at the nose and that would be a BAD thing... and I am guessing that bullet makers such as Bryan and Paul would be the first to agree. the bullet's nose was designed to give the best performance for that bullet.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]Are you saying that a change of the bullet's shape resulting from being fired from a rifle actually enhances the bullet's ballistics?[/FONT][/COLOR] [COLOR=black][FONT=Verdana][/FONT][/COLOR][ [COLOR=black][FONT=Verdana]Let me state my position clearly... I adamantly deny that a properly rifled rifle bore will change the shape of a bullet that is not being pushed beyond it's limitations. Therefore, since according to the physical laws of the universe, which can not be altered, the ballistic drag coefficient can not be changed from being fired from a rifle bore, since the bullet's drag coefficient is completely dependent upon it's shape and mass alone. any other "apparent" effects on the bullet such as coning, etc., are external factors and have nothing to do with the bullet's drag coefficient.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]If this is wrong, I would like to see proof. Over in the "other" thread, they have a whole list of things that might explain discrepancies between published and individually field tested BC's.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]In the mean time you have a system that works for and as I've already stated to Eddybo and whoever, that's great. Making the shot is what it's all about.[/FONT][/COLOR] [COLOR=black][FONT=Verdana]As for me, I'll start with the best info available, which IMO is BL's G7's. If my actual results differ, and I can't figure out why, then I'll adjust accordingly.[/FONT][/COLOR] [/QUOTE]
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