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Long Range Hunting & Shooting
Accuracy change with Altitude change.
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<blockquote data-quote="4xforfun" data-source="post: 719227" data-attributes="member: 9172"><p>BROZ,</p><p> </p><p> </p><p> </p><p>Agreed....but....I would think that you would have to be on the very edge for that to happen. I have a 1-12 twist 30 cal that I planned on shooting the 187 BIB in 1K. That didn't work out, so I decided to try the new 200 Berger Hybrid, even though I was told it wouldn't stablize. VUNDERBULLET !!!...at least for now. Checking the stabilization program says that I am in the "yellow".... on the edge....something under 1.1 factor. I am not sure how it works, but if it works at sea level it should work at a higher alt...or is it visa versa? If it is visa versa, then yes....IF.... you are already on the edge. This IS something that I might worry about with this paticular bbl if I end up shooting at a match in Colorado. Right now I never see a range with an alt over 1500 feet.</p><p> </p><p>But this is really splitting hairs. What changes group size is harmonics....barrel time. Change the time the bullet is in the tube and you will change group size. You can change group size by changing neck tension...BUT once you find the right tension for a bbl, it never changes, regaurdless of powder types/charge/altitude/temp/ect..... Same with seating depth....you can change the shape/size of a group by changing seating depth of the bullet...but, once you find it, for that bullet, it won't change (in relationship to the lands) no matter what powder and speed you shoot. </p><p> </p><p>Interior balistics.</p></blockquote><p></p>
[QUOTE="4xforfun, post: 719227, member: 9172"] BROZ, Agreed....but....I would think that you would have to be on the very edge for that to happen. I have a 1-12 twist 30 cal that I planned on shooting the 187 BIB in 1K. That didn't work out, so I decided to try the new 200 Berger Hybrid, even though I was told it wouldn't stablize. VUNDERBULLET !!!...at least for now. Checking the stabilization program says that I am in the "yellow".... on the edge....something under 1.1 factor. I am not sure how it works, but if it works at sea level it should work at a higher alt...or is it visa versa? If it is visa versa, then yes....IF.... you are already on the edge. This IS something that I might worry about with this paticular bbl if I end up shooting at a match in Colorado. Right now I never see a range with an alt over 1500 feet. But this is really splitting hairs. What changes group size is harmonics....barrel time. Change the time the bullet is in the tube and you will change group size. You can change group size by changing neck tension...BUT once you find the right tension for a bbl, it never changes, regaurdless of powder types/charge/altitude/temp/ect..... Same with seating depth....you can change the shape/size of a group by changing seating depth of the bullet...but, once you find it, for that bullet, it won't change (in relationship to the lands) no matter what powder and speed you shoot. Interior balistics. [/QUOTE]
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Accuracy change with Altitude change.
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