A bloke at my club had one in .177 and hated it. Wouldn't group at all. Eventually got rid.
Mine's in .22 and is very accurate.
My own feeling is that, being a light rifle, it's much more difficult to shoot accurately in the smaller calibre.
That's why, when I wanted a .177 gasram, I opted for the Fenman, which is almost a pound heavier.
My Fenman is also exremely accurate.
Just my opinion, but I hope it helps.