My first take on any form of OWC test - Can I get opinions?

[Winny94]

I did this variation of Saterlee test (mostly as a test/practice since ive never done this type of precison reloading) - I shot 13 3-shot groups of each weight charge and plotted it. The groups across the board were not fantastic, but it was 35 degrees, 30 MPH wind, and I was freezing, so not optimal conditions. I have my own opinions on what charge ranges I should look into, but im more interested in getting opinions on those who have much more experince than I do.

Thanks for any insight.

Cartridge: 6.5CM
Powder: RL16
Brass: Norma LRP
Primer: CCI LRP
Bullet: 130gr ELD-M