I'd reach out to the match director and see if there's any chance they have a loaner rifle you could use if you covered ammo costs. Many do, and it'll probably be a little bit more appropriate setup.
A fast twist 223 with a GOOD bullet (75, 80, or 88 ELD, 85.5 Bergers, the heavier Sierra's...
Enjoy the productivity bump of the progressive!
With the sensitivity of the FX120i, having it isolated from the press is pretty key. I've played around with everything, and really like the ergonomics of how I have mine setup now.
On the measures it depends on the powder, with ball powder...
Eyeballing the scope reticle to the action is plenty good enough.
The thing I'll use a tool for is to make sure the scope is level per the reticle when I'm attaching the level to the scope. (Bubble or laser level) If I'm getting picky, I'll double check actual corrections on paper at 100 yds...
https://swappa.com/
I've probably bought a dozen over the years second hand through Swappa for myself, family, and friends. I usually look for current year models that have enough discount to make it worthwhile. There's money to be saved if you're willing to sort through them.
Yes, factories have access to powders reloaders don't.
With the group size disparity, are you shooting enough rounds to be confident you aren't just seeing noise in the data? Different powders certainly can change precision. There should be a number of powders available that would be good...
I have both the RS1.2 and the NX8 4-32 on rifles. Both good, I prefer the Mil-C on the NX8 for NRL Hunter, and the Maven reticle for actual hunting, and the scopes are distributed accordingly.
I’ve used most Leupolds and the Tenmile, and personally prefer what I’ve got.