View attachment 341034
Looks to me like you have a flat spot where velocity does not change a lot around 52.5 gr at 2905 and 52.7 at 2908.
A Possible higher node would be 53.9 at 2988 to 54.3 at 2985.
I would load at 54.3 and work down with 3 shot groups at .1 gr reductions to see where they group best,
and I would start at 52. 7 and do the same going down with 3 shot groups.
I don't like using a magneto speed when I run Satterlee because it will shift POI and may also affect velocity.
It certainly will affect where the barrel tip is pointing and the harmonics.
You could run an Audette Ladder at 300 and even run this test at 200 or 300 to get more definition on POI
at distance. These flat spots are just places to further tune from in 3 shot groups in my book. But you have to do that without the weight hanging from your rifle bbl or you will never get anywhere in real life at the bench or hunting because that
magneto speed wont be on your bbl then. Best to run Satterlee and start using a regular Chronograph or Labradar if possible.
Just my druthers......Good Luck.