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<blockquote data-quote="SDMF" data-source="post: 321703" data-attributes="member: 412">It's just mechanics and vocabulary with some experience sprinkled in.&nbsp; Hornady used to include a ~15min DVD with their loading manual.&nbsp; IT looked to have been actually made in the late 60's or very early 70's.&nbsp; In that DVD old-man Hornady talked about their processes and how keeping the COG in the actual center of the bullet was of paramount importance.&nbsp; It would then flash to some of-the-era technical animation that showed a bullet spinning on and off axis.Most short range (100-200yd) Benchrest matches limit the shooters to either .308 cal or .338 cal projectile diameter.&nbsp; They do this because the larger the diameter of the projectile, the easier it is to make it &quot;round&quot;.&nbsp; If they let them neck 308's up to .375 they'd need high-speed cameras and some sort of light/laser grid for the bullet to pass through in order to be able to determine the winner as all the groups would be &quot;one-hole&quot;.&nbsp; Ever hear someone talk about how well their 375 H&amp;H or some other larger bore diameter rifle shoots?&nbsp; Projectiles with a COG that matches the true centerline axis are easier to make the larger diameter they are.If the COG of the projectile matches the centerline axis AND the centerline axis of the projectile aligns to travel the actual centerline axis of the rifled bore (rifle or handgun) assuming enough twist and velocity to stabilize the projectile, it'll be reasonably accurate.&nbsp; That has to be &quot;Job 1&quot;.&nbsp; Get those 3 things right, you can then run down the rabbit hole chasing 3, decimal place neck tension and all the rest of the tunnels down that deep rabbit hole.&nbsp; Fail to line up the COG/Centerline of the projectile properly, and/or don't get the projectile placed headed down&nbsp; the centerline of the bore there's no need to hop to the rabbit hole, you're just gonna waste a bunch of components and bbl life.</blockquote>

[QUOTE="SDMF, post: 321703, member: 412"] It's just mechanics and vocabulary with some experience sprinkled in. Hornady used to include a ~15min DVD with their loading manual. IT looked to have been actually made in the late 60's or very early 70's. In that DVD old-man Hornady talked about their processes and how keeping the COG in the actual center of the bullet was of paramount importance. It would then flash to some of-the-era technical animation that showed a bullet spinning on and off axis. Most short range (100-200yd) Benchrest matches limit the shooters to either .308 cal or .338 cal projectile diameter. They do this because the larger the diameter of the projectile, the easier it is to make it "round". If they let them neck 308's up to .375 they'd need high-speed cameras and some sort of light/laser grid for the bullet to pass through in order to be able to determine the winner as all the groups would be "one-hole". Ever hear someone talk about how well their 375 H&H or some other larger bore diameter rifle shoots? Projectiles with a COG that matches the true centerline axis are easier to make the larger diameter they are. If the COG of the projectile matches the centerline axis AND the centerline axis of the projectile aligns to travel the actual centerline axis of the rifled bore (rifle or handgun) assuming enough twist and velocity to stabilize the projectile, it'll be reasonably accurate. That has to be "Job 1". Get those 3 things right, you can then run down the rabbit hole chasing 3, decimal place neck tension and all the rest of the tunnels down that deep rabbit hole. Fail to line up the COG/Centerline of the projectile properly, and/or don't get the projectile placed headed down the centerline of the bore there's no need to hop to the rabbit hole, you're just gonna waste a bunch of components and bbl life. [/QUOTE]

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