Contacted Sierra with no luck. Anyone know the SG factor
for a 6.5 142 Sierra Match King and a 6.5 Nosler 140 Ballistic tip? Thanks in advance.
for a 6.5 142 Sierra Match King and a 6.5 Nosler 140 Ballistic tip? Thanks in advance.
Range Report Need (SG) gyro stability factor for a Sierra 142MK
- Thread starter silentbushmaster
- Start date
Re: Need (SG) gyro stability factor for a Sierra 142MK
Don't you need a velocity to calculate this and a twist rate?
Don't you need a velocity to calculate this and a twist rate?
Re: Need (SG) gyro stability factor for a Sierra 142MK
Definitely need to have the projectile dimensions, velocity, and twist rate. Alternatively, if you know the dimensions and a reasonable estimate of the velocity you expect, you can determine a twist rate necessary to achieve a specific Sg by inputting different twist rates here:
http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi
Definitely need to have the projectile dimensions, velocity, and twist rate. Alternatively, if you know the dimensions and a reasonable estimate of the velocity you expect, you can determine a twist rate necessary to achieve a specific Sg by inputting different twist rates here:
http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi
Re: Need (SG) gyro stability factor for a Sierra 142MK
I appreciate the link, easy to calculate now. Thanks
I appreciate the link, easy to calculate now. Thanks
