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Long Range Hunting & Shooting
**HELP** Need to understand trajectory(heavy VS light) in bullets.
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<blockquote data-quote="rscott5028" data-source="post: 448115" data-attributes="member: 24624"><p>I'm no physics expert, but I think weight has something to do with mass in motion, yada yada Perhaps someone can explain the physics of all that... and, mass x velocity = energy which combined with expansion characteristics and bullet placement relate to terminal ballistics and lethality. ...and, then you get vastly different approaches such as the Berger vs Barnes debate. </p><p> </p><p>None of which really has to do with flat shooting. Trajectory is mostly a function of muzzle velocity and BC. </p><p> </p><p>In any case you have to keep in mind that for a given diameter bullet to be heavier, it either has to be (a) longer, (b) different shape ogive/tail, and/or (c) different materials. </p><p> </p><p>Since you indicated "same bullets", I assume you really mean same materials/density. So, the shape/length changed affecting the BC with heavier (meaning longer) bullets often being of a higher BC although, you sometimes get longer/heavy/round nose bullets which are lower BC. </p><p> </p><p>Also, you want to keep in mind that boat tails, etc have varying effectiveness at different velocities i.e. sub/super-sonic. Hence, some would say that an accurate trajectory curve would be characterized by multiple BCs. </p><p> </p><p>We usually think of boat tails for long range and associate high velocity with boat tail/VLD. But, I think I read somewhere that boat tails aren't really helping above around 2000fps (or somewhere thereabouts). Hence, flat base bullets are preferred by benchrest shooters out to 200 yds. And, boat tails/VLD shine at longer ranges after their velocity has dropped somewhat. </p><p> </p><p>I guess that's where the expression came from where people talk about VLDs "going to sleep" after about 200 yds. </p><p> </p><p>...just my thoughts. I'd be keen to here from the experts.</p><p> </p><p>thanks!</p><p>Richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 448115, member: 24624"] I'm no physics expert, but I think weight has something to do with mass in motion, yada yada Perhaps someone can explain the physics of all that... and, mass x velocity = energy which combined with expansion characteristics and bullet placement relate to terminal ballistics and lethality. ...and, then you get vastly different approaches such as the Berger vs Barnes debate. None of which really has to do with flat shooting. Trajectory is mostly a function of muzzle velocity and BC. In any case you have to keep in mind that for a given diameter bullet to be heavier, it either has to be (a) longer, (b) different shape ogive/tail, and/or (c) different materials. Since you indicated "same bullets", I assume you really mean same materials/density. So, the shape/length changed affecting the BC with heavier (meaning longer) bullets often being of a higher BC although, you sometimes get longer/heavy/round nose bullets which are lower BC. Also, you want to keep in mind that boat tails, etc have varying effectiveness at different velocities i.e. sub/super-sonic. Hence, some would say that an accurate trajectory curve would be characterized by multiple BCs. We usually think of boat tails for long range and associate high velocity with boat tail/VLD. But, I think I read somewhere that boat tails aren't really helping above around 2000fps (or somewhere thereabouts). Hence, flat base bullets are preferred by benchrest shooters out to 200 yds. And, boat tails/VLD shine at longer ranges after their velocity has dropped somewhat. I guess that's where the expression came from where people talk about VLDs "going to sleep" after about 200 yds. ...just my thoughts. I'd be keen to here from the experts. thanks! Richard [/QUOTE]
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**HELP** Need to understand trajectory(heavy VS light) in bullets.
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