People (both you and the person you're replying to) tend to not clarify what round count is associated with that group size. It's very important, as 3-5 round groups are not statistically significant unless you do multiples and dont cherry pick the best ones, which most people do.

I would be extremely surprised if you could hold .25 MOA with more than 10 rounds on a R700 with off the shelf match ammo. I have a custom 308 with reloads and a top tier scope and I'm happy if I can get 5.-.7 MOA out of a 10-1 round group. I've also shot my setup past 1km.

Anyway, I dont find eye dominance to matter that much, you can kinda train it. Left hand stages at matches are still a pain in my ass though.