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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
30 cal 230gr Sierra matchking .8bc
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<blockquote data-quote="NEMTHunter" data-source="post: 1440191" data-attributes="member: 77631"><p>Looks like they are working out good for you. I have a feeling the shorter bearing surface is keeping the pressure down so it might take more powder to hit the same speeds. But I would guess at the same pressure they should be faster.</p><p></p><p>Another thing setting the 2000 and below fps BC to .700 will make you hit high. For under 1600 they call for a BC of .740</p><p></p><p>Here is what sierra calls for 1880 fps and above BC of .800 Between 1600 and 1880 a BC of .780 and Under 1600 a BC of .740.</p><p></p><p>So by calling for a BC of .700 under 2000, you will be hitting high when you hit the range where the bullet hits 2000fps and below.</p><p></p><p>add the BC up and the average is about .773 But it looks like you have the ability to do stepped BC in your program. If thats the case I would go with what Sierra calls for. You should then be dead on the 2250 plate next time.</p></blockquote><p></p>
[QUOTE="NEMTHunter, post: 1440191, member: 77631"] Looks like they are working out good for you. I have a feeling the shorter bearing surface is keeping the pressure down so it might take more powder to hit the same speeds. But I would guess at the same pressure they should be faster. Another thing setting the 2000 and below fps BC to .700 will make you hit high. For under 1600 they call for a BC of .740 Here is what sierra calls for 1880 fps and above BC of .800 Between 1600 and 1880 a BC of .780 and Under 1600 a BC of .740. So by calling for a BC of .700 under 2000, you will be hitting high when you hit the range where the bullet hits 2000fps and below. add the BC up and the average is about .773 But it looks like you have the ability to do stepped BC in your program. If thats the case I would go with what Sierra calls for. You should then be dead on the 2250 plate next time. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
30 cal 230gr Sierra matchking .8bc
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