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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hammer bullets stabilization
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<blockquote data-quote="RockyMtnMT" data-source="post: 1915418" data-attributes="member: 7999"><p>Yes 1-10" is a min twist for the 181g Hammer Hunter. Same with all of the listed min twist for Hammer Bullets. The listed twist is a min twist. If a hunter is going to be at low elevation and very cold temp there is definitely potential for problems. We have taken a lot of game with the 181g Hammer Hunter here in MT in bad weather, but we are always at 3000' elev or higher. When I set up my own rifles I choose bullets that give higher than min stability. Particularly if running heavy for caliber. The longer for caliber copper bullets get the relatively more stability is needed. The Miller formula does not take into account for material density. I think when it was developed it wasn't a thought since everything was lead. Nor were they making bullets so long for caliber as there are today. It will take someone much smarter than I am to make a new stability formula that lines up better with modern projectiles. The other thing that should be noted is that the stability is calculated for ballistic stability not terminal stability. Ballistic stability is what is needed to fly with correct orientation. Marginally stable bullets can fly very accurately. No matter what kind of bullet is being used, it will work better for terminal performance if the stability is higher. The higher stability will keep the nose point on after impact so the bullet can deform properly. Marginally stable bullets flying very accurately will have a much higher probability of not performing properly after impact. In my opinion many of the reports of bullet failures are due to marginal stability. I think the same bullet fired with higher stability would have had much better results.</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1915418, member: 7999"] Yes 1-10" is a min twist for the 181g Hammer Hunter. Same with all of the listed min twist for Hammer Bullets. The listed twist is a min twist. If a hunter is going to be at low elevation and very cold temp there is definitely potential for problems. We have taken a lot of game with the 181g Hammer Hunter here in MT in bad weather, but we are always at 3000' elev or higher. When I set up my own rifles I choose bullets that give higher than min stability. Particularly if running heavy for caliber. The longer for caliber copper bullets get the relatively more stability is needed. The Miller formula does not take into account for material density. I think when it was developed it wasn't a thought since everything was lead. Nor were they making bullets so long for caliber as there are today. It will take someone much smarter than I am to make a new stability formula that lines up better with modern projectiles. The other thing that should be noted is that the stability is calculated for ballistic stability not terminal stability. Ballistic stability is what is needed to fly with correct orientation. Marginally stable bullets can fly very accurately. No matter what kind of bullet is being used, it will work better for terminal performance if the stability is higher. The higher stability will keep the nose point on after impact so the bullet can deform properly. Marginally stable bullets flying very accurately will have a much higher probability of not performing properly after impact. In my opinion many of the reports of bullet failures are due to marginal stability. I think the same bullet fired with higher stability would have had much better results. [/QUOTE]
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Hammer bullets stabilization
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