Ladder questions

[jlmurphy]

I have searched the archives and read Constantine's article on Audette's original concept the Ladder type test for powder charge weight. Constantine addressed the issue of recoil and barrel vibrations forming intersections or nodes where charge weights can overlap, but unless I missed it, the velocity was considered uniformly increasing throughout the range,yet other threads mention plateaus of velocity. Can anyone here help me read the velocity results of a ladder test, or is velocity secondary to vibration patterns.

 

[John Kielly]

Constantine addressed the issue of recoil and barrel vibrations forming intersections or nodes where charge weights can overlap, but unless I missed it, the velocity was considered uniformly increasing throughout the range,yet other threads mention plateaus of velocity.

I've tested loads in that manner while shooting over a chronograph & while I have recorded coinciding strike of rounds with differing powder loads, my chronograph results show velocities that increase close enough to linear. However, it could be argued that I have been operating in too small a range of powder loads, as these tests were to select long range Palma loads with 155 SMKs or flat out loads with Berger 210s.

In any case, the outcome was satisfactory.