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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet touching the lands or 2000th back?
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<blockquote data-quote="johnnyk" data-source="post: 1669328" data-attributes="member: 307"><p>Ogive shape has a little bit to do with jump distance, I think. When you shoot bullets with tangent ogives (i.e. Sierra SMK's, GK's, Nosler BT's, AB's, Partitions, Speer's), with more "rounded" noses, these tend to be less finicky about exact seating depth and are "easier" to find a accurate load for. I ran these at .010" off and that was the norm, I never deviated. Accuracy was good, always. It was just a matter of finding the powder load that shot the best.</p><p>Then Hornady starting putting out (or I just became aware of) bullets with secant ogives (SST's, A-max's), which are more "missile", straight nosed shape. I tried them (using my old "norm" of seating .010" off) and I cussed and I cussed and swore that Hornady didn't know a darn thing about making bullets.</p><p>[ATTACH]140677[/ATTACH] </p><p>This is about twenty years or so ago, before LR became all the rage and the highest BC wins the race. Laser RF's were just coming out and "Trashco" was one of the first companies with one! My buddy had one and it was as big as a 8mm projector. Cell phones weren't everywhere, so no ballistic apps, bluetooth, etc.</p><p>I walked all the yardages and measured the bullet drops and wrote them down or committed them to memory. Whew! thank God for Silicon Valley!</p><p>With all that said; even now the seating depth can vary even on the same style bullet, especially if the bullets are different Lot #'s or you're not using a VLD type seating stem in your seating die. I'm not sure any one manufacturer can be that consistent all the time. Grab a box of bullets and with a precise caliper, measure the overall length, bearing surface and/or weigh them. Now weigh/measure your cases. Do you put heavier bullets with lighter cases or heavier with heavier? It's a wonder we hit anything over 500yds! Lol! But's it's dang fun and very addicting! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="johnnyk, post: 1669328, member: 307"] Ogive shape has a little bit to do with jump distance, I think. When you shoot bullets with tangent ogives (i.e. Sierra SMK's, GK's, Nosler BT's, AB's, Partitions, Speer's), with more "rounded" noses, these tend to be less finicky about exact seating depth and are "easier" to find a accurate load for. I ran these at .010" off and that was the norm, I never deviated. Accuracy was good, always. It was just a matter of finding the powder load that shot the best. Then Hornady starting putting out (or I just became aware of) bullets with secant ogives (SST's, A-max's), which are more "missile", straight nosed shape. I tried them (using my old "norm" of seating .010" off) and I cussed and I cussed and swore that Hornady didn't know a darn thing about making bullets. [ATTACH]140677[/ATTACH] This is about twenty years or so ago, before LR became all the rage and the highest BC wins the race. Laser RF's were just coming out and "Trashco" was one of the first companies with one! My buddy had one and it was as big as a 8mm projector. Cell phones weren't everywhere, so no ballistic apps, bluetooth, etc. I walked all the yardages and measured the bullet drops and wrote them down or committed them to memory. Whew! thank God for Silicon Valley! With all that said; even now the seating depth can vary even on the same style bullet, especially if the bullets are different Lot #'s or you're not using a VLD type seating stem in your seating die. I'm not sure any one manufacturer can be that consistent all the time. Grab a box of bullets and with a precise caliper, measure the overall length, bearing surface and/or weigh them. Now weigh/measure your cases. Do you put heavier bullets with lighter cases or heavier with heavier? It's a wonder we hit anything over 500yds! Lol! But's it's dang fun and very addicting! :) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Bullet touching the lands or 2000th back?
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