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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Badlands Precision Bullets thread - From BC to terminal ballistics
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<blockquote data-quote="nralifer" data-source="post: 2857279" data-attributes="member: 94556"><p>The SD is not a function of the bullet but rather a function of the brass mostly. Your group shows some promise since it looks like 4 of the 5 shots maybe grouped sub-MOA. The photo below shows the stability calculator result given the data you sent. Stability is very marginal. There is a significant difference between a 1:10 vs a 1:9 twist, the latter providing much more stability to the bullet. See second photo. Better stability likely will result in smaller groups. For hunting what really counts is the first and second shot, especially the first which is always a cold bore shot. The other factor is the temperature. If you develop a load in the summer with marginal stability and hunt in the fall or winter where temps could be 50 degrees or more cooler, then stability will be less. The third photo shows what station pressure you need at 32F to have the bullet adequately stabilized (stability factor =1.45 or greater) in winter temps.</p></blockquote><p></p>
[QUOTE="nralifer, post: 2857279, member: 94556"] The SD is not a function of the bullet but rather a function of the brass mostly. Your group shows some promise since it looks like 4 of the 5 shots maybe grouped sub-MOA. The photo below shows the stability calculator result given the data you sent. Stability is very marginal. There is a significant difference between a 1:10 vs a 1:9 twist, the latter providing much more stability to the bullet. See second photo. Better stability likely will result in smaller groups. For hunting what really counts is the first and second shot, especially the first which is always a cold bore shot. The other factor is the temperature. If you develop a load in the summer with marginal stability and hunt in the fall or winter where temps could be 50 degrees or more cooler, then stability will be less. The third photo shows what station pressure you need at 32F to have the bullet adequately stabilized (stability factor =1.45 or greater) in winter temps. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Badlands Precision Bullets thread - From BC to terminal ballistics
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