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Hunting
Long Range Hunting & Shooting
Help with ballistics please.
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<blockquote data-quote="robbobsam" data-source="post: 474632" data-attributes="member: 25432"><p>Hiya Trebark,</p><p></p><p>Thank you for your time. If you play with the JBM stability calculator, add the correct bullet length and barrel twist, then keep reducing the velocity of the bullet you will see that when you reduce the velocity to below 2738fps it goes from green to yellow indicating that it starting to lose stability. Therefore I am assuming that the 87 grain V-Max bullet in .243win is unstable with that barrel twist of 1 in 10 at less that 2738fps.</p><p></p><p>I then run exbal, adding all the relevant data relating the Bullet velocity, BC sight in height etc...etc...etc... and you will see you are only 175yds away when the velocity of the bullet has reduced from muzzle velocity to the unstable velocity of 2738fps.</p><p></p><p>Am I making that clear ???</p><p></p><p>If not I will try again.</p></blockquote><p></p>
[QUOTE="robbobsam, post: 474632, member: 25432"] Hiya Trebark, Thank you for your time. If you play with the JBM stability calculator, add the correct bullet length and barrel twist, then keep reducing the velocity of the bullet you will see that when you reduce the velocity to below 2738fps it goes from green to yellow indicating that it starting to lose stability. Therefore I am assuming that the 87 grain V-Max bullet in .243win is unstable with that barrel twist of 1 in 10 at less that 2738fps. I then run exbal, adding all the relevant data relating the Bullet velocity, BC sight in height etc...etc...etc... and you will see you are only 175yds away when the velocity of the bullet has reduced from muzzle velocity to the unstable velocity of 2738fps. Am I making that clear ??? If not I will try again. [/QUOTE]
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Help with ballistics please.
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