Originally Posted by Charlts
Sounds daft but did you fill it in the warm and then check it in the cold? Try filling in the warm and then checking the next day in the warm, you'll probably drop about 10bar as the air cools in the cylinder then it'll remain constant. That's what mine does anyway, I dropped about 25 bar going outside last weekend.
Just to be sure I have refilled to 226bar removed the shroud and fitted a balloon to the barrel and filler valve