I do all my initial load development at 300y with a chronograph.
I'm looking for my Sd's in the single digit and 5 shot groups usually between 3/4"-1".
I usually play with seating depth and neck tension at 600y.
In the past 16 years I have owned over 50 gas guns and honestly 1 MOA @ 600m is crazy good for a small or large frame gas gun!
The problem is see with most gas guns aren't always the rifle.... it's usually the shooter or the ammo.
I have a little collection of Mil. gas guns and I like to...