Here's the results from today's experimentation. Targets set out at 121 yards with a 7mph 45 degree crosswind. All shots were 5 shot groups:
Powder weights from 25.2 - 25.6gr
COAL adjustment using 25.1gr which I figured had the best potential following yesterday's results.
Think I'll stick with 25.1gr with a COAL of 2.290". I'm confident what little vertical stringing there was, was in fact down to me. It would've been helpful to have a finer dot to use as an aimpoint.
.22LR CZ452; .22 Hornet CZ527
Tikka T3 Varmint .223; .204 Ruger CZ527 Varmint;
6.5 Creed Bergara B14 HMR