At 1,000 yard many stock rifles run into the end of thier adjustments, which is never good for a scope (you want it to be more to the center).
Typically it starts at 800 yds so my rule of thumb - if it’s a 800 yard + rifle ... get 20 MOA rail, if it’s over 1,000.. think / research 30/40.. or more.
With 600 yards, and a 30mm tube you are typically OK... I’m sure there are exceptions.
I would focus on your typically target range, vs. the furthers range you’d shoot..
Meaning Easter woods hunting 600 yards is an exception (0 MOA is reasonable), Midwest / Western plains like West KS, anything under 300 is really rare - it’s more like 500yds is a common shot. (I’d think 20 MOA)
