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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
bullet ogive measuring for mile shooting
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<blockquote data-quote="a.JR" data-source="post: 37360" data-attributes="member: 1391"><p>Goodgrouper,You mention .004 ogive length tolerance,is this the bearing surface or just the base to ogive??...If 1 bullet is say .600 bc and the others .620 bc which is easy to get because of their exterior shapes then you can guess what happens to the elevation at target..I qualify for weight,AOL,base to ogive at land dia,base to ogive at 2 more dias up the ogive,bearing surface, overall dia and then trim the meplat ...Of all of these checks the most telling on paper is without exception is the bearing surface/meplat trim combo (the easy way)...And yes your right it does not matter if it's 1000 or 1760 yds...If you ever get to run 5 or 10 bullets that are identical enough times to test it will become clear that a usuable tune is more important than a small ES...Uneven projectiles will cause to many variables for you to establish the correct tune in the first place and the correct tune does not always mean the smallest ES in my Guns...JR..Jeff Rogers</p></blockquote><p></p>
[QUOTE="a.JR, post: 37360, member: 1391"] Goodgrouper,You mention .004 ogive length tolerance,is this the bearing surface or just the base to ogive??...If 1 bullet is say .600 bc and the others .620 bc which is easy to get because of their exterior shapes then you can guess what happens to the elevation at target..I qualify for weight,AOL,base to ogive at land dia,base to ogive at 2 more dias up the ogive,bearing surface, overall dia and then trim the meplat ...Of all of these checks the most telling on paper is without exception is the bearing surface/meplat trim combo (the easy way)...And yes your right it does not matter if it's 1000 or 1760 yds...If you ever get to run 5 or 10 bullets that are identical enough times to test it will become clear that a usuable tune is more important than a small ES...Uneven projectiles will cause to many variables for you to establish the correct tune in the first place and the correct tune does not always mean the smallest ES in my Guns...JR..Jeff Rogers [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
bullet ogive measuring for mile shooting
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