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Question on 7mm RM and 180gr. Bergers
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<blockquote data-quote="barefooter56" data-source="post: 1442962" data-attributes="member: 85389"><p>Cody and all,</p><p>Thanks for the kind words about our bullets performance on game! However, there is a lot of misunderstanding about our TWIST RATE CALCULATOR. The two words "MARGINALLY STABLE" are the problem. For a bullet to be completely unstable the STABILITY FACTOR (SG) number has to be below 1.0 ( personally I fudge it to 1.1 to give me some cushion). The numbers 1.0 to 1.49 only indicate how much the BC of the bullet is affected. Those numbers are indicated by an adjusted BC value and a percentage the BC is also affected. What they don't mean is that the bullet will become unstable and start to tumble at a certain yardage down range. The bullet will be flying point forward until it hits the dirt. Out to about 600 yards you wont see much more effect on the bullet due to external conditions such as wind. From 600 yards on out you will notice more effect on the bullet by conditions due to the compromised BC . And if you were a TARGET SHOOTER trying to hit a target out where the bullet goes in to the TRANS or SUBSONIC stages of its flight you would lose the spin rate stability faster to help stabilize the bullet as it passes through these stages. <a href="http://www.appliedballisticsllc.com/Articles/ABDOC2.6%20-%20Transonic%" target="_blank">http://www.appliedballisticsllc.com/Articles/ABDOC2.6 - Transonic%</a></p><p>20Effects%20on%20Bullet%20Stability%20&%20BC.pdf</p><p>ALTITUDE is the biggest factor there is in making up for lack of barrel twist rate. Velocity and Temperature help. But ALTITUDE is the big one. Always make sure you base your barrel twist rate on the LOWEST ALTITUDE you will be shooting at. In regards to our new Optimal Barrel Twist Rates. These are all based on a worst case scenario of 59 degrees at SEA LEVEL. We did this because we discovered that there were a couple twist rates we had listed that would not stabilize the bullet at 59 degrees at sea level so we changed them all so that now you know what you need from sea level on up to work. This will explain why the BC changes :<a href="http://www.bergerbullets.com/update-of-berger-bullets-performance-data/" target="_blank">http://www.bergerbullets.com/update-of-berger-bullets-performance-data/</a></p><p>Hope this helps make things clearer in regards to The TWIST RATE CALCULATOR ETC. If you have any more questions please let us know!</p><p>PS New phone number is 660-460-2802 8am to 4:30pm EASTERN MON thru FRI</p></blockquote><p></p>
[QUOTE="barefooter56, post: 1442962, member: 85389"] Cody and all, Thanks for the kind words about our bullets performance on game! However, there is a lot of misunderstanding about our TWIST RATE CALCULATOR. The two words "MARGINALLY STABLE" are the problem. For a bullet to be completely unstable the STABILITY FACTOR (SG) number has to be below 1.0 ( personally I fudge it to 1.1 to give me some cushion). The numbers 1.0 to 1.49 only indicate how much the BC of the bullet is affected. Those numbers are indicated by an adjusted BC value and a percentage the BC is also affected. What they don't mean is that the bullet will become unstable and start to tumble at a certain yardage down range. The bullet will be flying point forward until it hits the dirt. Out to about 600 yards you wont see much more effect on the bullet due to external conditions such as wind. From 600 yards on out you will notice more effect on the bullet by conditions due to the compromised BC . And if you were a TARGET SHOOTER trying to hit a target out where the bullet goes in to the TRANS or SUBSONIC stages of its flight you would lose the spin rate stability faster to help stabilize the bullet as it passes through these stages. [URL='http://www.appliedballisticsllc.com/Articles/ABDOC2.6%20-%20Transonic%']http://www.appliedballisticsllc.com/Articles/ABDOC2.6 - Transonic%[/URL] 20Effects%20on%20Bullet%20Stability%20&%20BC.pdf ALTITUDE is the biggest factor there is in making up for lack of barrel twist rate. Velocity and Temperature help. But ALTITUDE is the big one. Always make sure you base your barrel twist rate on the LOWEST ALTITUDE you will be shooting at. In regards to our new Optimal Barrel Twist Rates. These are all based on a worst case scenario of 59 degrees at SEA LEVEL. We did this because we discovered that there were a couple twist rates we had listed that would not stabilize the bullet at 59 degrees at sea level so we changed them all so that now you know what you need from sea level on up to work. This will explain why the BC changes :[URL]http://www.bergerbullets.com/update-of-berger-bullets-performance-data/[/URL] Hope this helps make things clearer in regards to The TWIST RATE CALCULATOR ETC. If you have any more questions please let us know! PS New phone number is 660-460-2802 8am to 4:30pm EASTERN MON thru FRI [/QUOTE]
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Question on 7mm RM and 180gr. Bergers
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