Mine is a 300, and current barrel is not throated long, so I see pressure starting around 96 grains. I have a new barrel that is throated for 4.155 COAL with 250 A-Tips's, so maybe I'll be able to fill her up in the style of Piper Perri.
Been toying with the idea of an Edge vs something larger, 33XC or 375 CT, so interested in knowing the limits of different barrel trims.