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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger 22cal. 90gr. VLD
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<blockquote data-quote="barefooter56" data-source="post: 1153321" data-attributes="member: 85389"><p>Use the TWIST RATE CALCULATOR on our website under the BALLISTICS tab to help making a more informed decision on what twist you need for your application. What many folks do not do is enter the correct or as close to correct altitude. This makes a very big difference ! Bigger than velocity! Keep in mind that if you have an SG ( stability factor ) in mind that with the velocities you all are listing you may not need that tight of a twist rate . Play with the calculator and enter in twist rates that are slower than what your bullet calls for and check the SG you get. Keep in mind that if you will be shooting at different altitudes you want to use the LOWEST ALTITUDE ! ( EXAMPLE) If your stability factor is in the 1.4-1.49 range and you show a 2% compromise on the BC of the bullet BUT you don't have bullet failure issues due to the barrel twist rate you have you are still ok . You just have to read the conditions a little closer. When you get in the 3400 fps plus range you need to pay attention to twist rate and barrel length to limit the amount of friction and heat on the (READ ANY) bullet. We figure our OPTIMUM twist rates on a temperature of 59 degrees and 0 feet altitude as a WORST case scenario of the twist rate needed for 1.5-1.6 SG so the bullet will be stable in any environment at the velocities in our load manual.</p><p>Hope this helps guys!</p><p>Happy New Year to you all !</p></blockquote><p></p>
[QUOTE="barefooter56, post: 1153321, member: 85389"] Use the TWIST RATE CALCULATOR on our website under the BALLISTICS tab to help making a more informed decision on what twist you need for your application. What many folks do not do is enter the correct or as close to correct altitude. This makes a very big difference ! Bigger than velocity! Keep in mind that if you have an SG ( stability factor ) in mind that with the velocities you all are listing you may not need that tight of a twist rate . Play with the calculator and enter in twist rates that are slower than what your bullet calls for and check the SG you get. Keep in mind that if you will be shooting at different altitudes you want to use the LOWEST ALTITUDE ! ( EXAMPLE) If your stability factor is in the 1.4-1.49 range and you show a 2% compromise on the BC of the bullet BUT you don't have bullet failure issues due to the barrel twist rate you have you are still ok . You just have to read the conditions a little closer. When you get in the 3400 fps plus range you need to pay attention to twist rate and barrel length to limit the amount of friction and heat on the (READ ANY) bullet. We figure our OPTIMUM twist rates on a temperature of 59 degrees and 0 feet altitude as a WORST case scenario of the twist rate needed for 1.5-1.6 SG so the bullet will be stable in any environment at the velocities in our load manual. Hope this helps guys! Happy New Year to you all ! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger 22cal. 90gr. VLD
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