In Europe, all round bale silage is made with fixed chamber (soft core) balers: Mostly Welger and Krone balers, with a 130cm (51 inch) diameter.
Bigger round balers were used in straw sometimes, but most straw comes in big squares.
In Finland they bale silage after 6 hours of sun on the mower swath (no tedding and raking) and they weigh up to a ton each. In Holland the silage is much drier, about 350 to 500kg for a round bale.