Thread: Frustrating arvo at the range. Powder charges.

Originally Posted by gqhoon

Use ChronoPlotter to plot the velocities against powder weight and look for flat spots as per the graph below.
Attachment 195381

Selecting the middle of the flat spot, run a seating depth test starting at the depth used in the powder charge test above, and seat progressively shorter CBTO at 3 thou increments. Shoot 3-shot groups and record velocities. Look for where both small groups and low SD coincide. That’s your load.

Where does Erik suggest this? I've just had a quick skim through some videos but couldn't find this.
Looking for MV flat spots when your ES is ~80 FPS is a waste of time. In my experience most "flat spots" are a product of load variance and measurement error and aren't typically repeatable.
Looking for vertical on target (and choosing a charge that has low vertical variance compared to charges either side) makes sense, to understand what the barrel harmonic is doing.