I have been reasonably successful using the Quickload/ Chris Longs barrel time to get Optimum Charge Weight. Bear in mind this information is a starting point and somewhat generic but barrel times and velocity are key.
1st node is at 1.2018 mS, requires 39.84 grains of H-4350 for 53,079 psi and resultant velocity is 2749 fps.
2nd node is at 1.1270 mS, requires 41.82 grains of H-4350 for 61,168 psi and resultant velocity is 2873 fps.
The velocities will put you on a node, how you get the velocity matters little as long as you are using powders and pressure limits appropriate for the 243 Winchester.
Last edited by Axtell; 11/29/15.
