After I posted that I thought I should have said something to the effect that not all bales would be that dense. But still based on that a 500 lb. bale is going to be pretty short or awful loose.
I'll look in the truck and see if I still have a weight ticket. Not likely as we had no reason to keep it but I'll look for the nonbelievers. Last year was their first year with this 3x3 baler and it was averaging within 50 lbs of what their 3x4s balers were making and those were not loose bales. They were impressed. With the amount of hay they put up they know how to get the most out of their equipment. They ship many, many, truck loads of hay every year and winter cattle for other ranchers too. We have hay left this year,fewer horses, and lots of grass so far, so I don't know if we'll get hay this year or not, (wife's the horse nut) but if we do I'll be sure to post (if I can figure out how) the weight ticket if I can't find last years.
Kim