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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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<blockquote data-quote="LR3" data-source="post: 475887" data-attributes="member: 15336"><p>Grouper. Thanks for your comments. I ve read Bryan Litz,s book but I missed seeing his G 7 or 1 values if they were published for 350 gr smk. I started with the bc values Kirby suggested for the 375 AM of .77 or so and ended up using .835 and that tracks well out to 1 mile for all distances for the 350gr. For the 375 sniptac I found changing brass and load changed the bc from8 to .85bc. So I agree velocity is a big factor for G1. I also found that like you my 5.5-22 nfs scope increased moa more than marked. The Sand B tracked better on testing at 100yds. Clearly accurate scope input is critical. The AM is accurate for me to 9 inches at a mile but Kirby did better. The snipetac is nearly as good but has a lower velocity, is lighter, and has a shorter barrel and is more a carry hunting rifle. Kevin, yes the bullets are from defferent batches so here may differences. I measure temp, pressure, humidity etc before setup with Kesterel and Exbal input. For the Snipetac the bc has held true for 1000ft out to a mile and to 10,000 ft (for a 636 yd elk two shots mid chest 4 inches apart, and 1000yd rock popping). The point is I think that every bc has to be calculated to match rifle and load and bullet and scope beyond 1000 yds if using G1 values since velocity and scope inaccuracies are potential issues as Grouper pointed out. I hope Bryan will add his comments.</p></blockquote><p></p>
[QUOTE="LR3, post: 475887, member: 15336"] Grouper. Thanks for your comments. I ve read Bryan Litz,s book but I missed seeing his G 7 or 1 values if they were published for 350 gr smk. I started with the bc values Kirby suggested for the 375 AM of .77 or so and ended up using .835 and that tracks well out to 1 mile for all distances for the 350gr. For the 375 sniptac I found changing brass and load changed the bc from8 to .85bc. So I agree velocity is a big factor for G1. I also found that like you my 5.5-22 nfs scope increased moa more than marked. The Sand B tracked better on testing at 100yds. Clearly accurate scope input is critical. The AM is accurate for me to 9 inches at a mile but Kirby did better. The snipetac is nearly as good but has a lower velocity, is lighter, and has a shorter barrel and is more a carry hunting rifle. Kevin, yes the bullets are from defferent batches so here may differences. I measure temp, pressure, humidity etc before setup with Kesterel and Exbal input. For the Snipetac the bc has held true for 1000ft out to a mile and to 10,000 ft (for a 636 yd elk two shots mid chest 4 inches apart, and 1000yd rock popping). The point is I think that every bc has to be calculated to match rifle and load and bullet and scope beyond 1000 yds if using G1 values since velocity and scope inaccuracies are potential issues as Grouper pointed out. I hope Bryan will add his comments. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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