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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help with BC calculation
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<blockquote data-quote="Mysticplayer" data-source="post: 35206" data-attributes="member: 8947"><p>I told you something was weird. The vel was off a new Chrony at around 10ft. Did a few shots to get the vel. average. Have used this chrony to compare with other of my rifles and it matches. At worse, it is reading FASTER which would make the BC even higher!!!</p><p></p><p>To match my data, I am getting BC at 1 and higher. Bizarre.</p><p></p><p>Took it out yesterday morning and the come ups were again verfied. Then I started using the mil-dots at the preset mag (have confirmed mil dots subtend correctly at 100yds). Sure enough, bullets hit where they were supposed to.</p><p></p><p>So even if the turrents moved more then the clicks indicate, the mil dots are using the same amount of MOA elevation for the distance as the turrents.</p><p></p><p>Most of the shooting has been level to only a few degrees up. Weather has been warm to hot, dead calm and clear. Low humidity - perfect shooting weather.</p><p></p><p>I have always known that the Hornady poly tipped bullets had higher real world BC's then what was printed. I also expected these 140gr SST to be much higher then the 142gr MK and Lapuas because the SST are much longer.</p><p></p><p>Never thought it would be that high.</p><p></p><p>I know the bullet is not going faster then 2975fps because I am only using an '06 case and 58.5gr of H4831SC. A 6.5Win Mag load uses a lot more powder to go over 3000fps. Barrel length is 24" so we are in standard/well known territory.</p><p></p><p>Using Weaver bases and High Burris rings. haven't measured the scope height but not overly high.</p><p></p><p>All you 6.5 shooters may want to give this bullet a look. It will stabilize in 9 twist barrels and it does shoot very well. Would love to hear if anyone gets similar results.</p><p></p><p>Jerry</p><p></p><p>[ 08-18-2004: Message edited by: Jerry Teo ]</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 35206, member: 8947"] I told you something was weird. The vel was off a new Chrony at around 10ft. Did a few shots to get the vel. average. Have used this chrony to compare with other of my rifles and it matches. At worse, it is reading FASTER which would make the BC even higher!!! To match my data, I am getting BC at 1 and higher. Bizarre. Took it out yesterday morning and the come ups were again verfied. Then I started using the mil-dots at the preset mag (have confirmed mil dots subtend correctly at 100yds). Sure enough, bullets hit where they were supposed to. So even if the turrents moved more then the clicks indicate, the mil dots are using the same amount of MOA elevation for the distance as the turrents. Most of the shooting has been level to only a few degrees up. Weather has been warm to hot, dead calm and clear. Low humidity - perfect shooting weather. I have always known that the Hornady poly tipped bullets had higher real world BC's then what was printed. I also expected these 140gr SST to be much higher then the 142gr MK and Lapuas because the SST are much longer. Never thought it would be that high. I know the bullet is not going faster then 2975fps because I am only using an '06 case and 58.5gr of H4831SC. A 6.5Win Mag load uses a lot more powder to go over 3000fps. Barrel length is 24" so we are in standard/well known territory. Using Weaver bases and High Burris rings. haven't measured the scope height but not overly high. All you 6.5 shooters may want to give this bullet a look. It will stabilize in 9 twist barrels and it does shoot very well. Would love to hear if anyone gets similar results. Jerry [ 08-18-2004: Message edited by: Jerry Teo ] [/QUOTE]
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Help with BC calculation
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