I need a 12.5" Grendel or 6mmARC barrel

[Lemonaid]

I found a good article comparing accuracy with the top tier gas guns vs. a top bolt gun. It uses 6.5 Creed but it still gives a good idea of what to expect and to compare with what you have. https://precisionrifleblog.com/2016/07/2...-showdown/
Scroll down to the chart. "Typical group size"