Throat angle ??

[broncman]

With different ogives, secant, tangent etc, is a different throat angle optimum for each ogive style?

 

[artbosco]

With different ogives, secant, tangent etc, is a different throat angle optimum for each ogive style?

Dan Lilja thinks so. I use this as my guide [scroll down for the chart]: http://www.riflebarrels.com/articles/bullets_ballastics/throat_angles.htm

For example my 30BR has a 1 degree 30 throat angle [1.54 THROAT ANGLE IN DEGREES] so I use the 9 ogive [CALIBER TANGENT] bullet.