I had a 530 and now have a 375 which rolls a smaller diameter bale and is manually operated. I don't know the numbers on the 530 but here are the numbers on the 375 with new packing in the gate cylinders which are used for bale tensioning:
Gate closed is right at 1000#. You have a latch, this one relies on hyd press to hold it closed. When loading a "wad" of grass at a fairly fast ground speed, the bale forming pressure spikes to 3000 and as the machine distributes the wad the pressure drops back to around 17-
1800#. If you continuously cram a big WW it will stay at 3000.....apparently my machine has a 3000# pop-0ff valve. Bales are not so tight that you can't spear them. My 530 was adjusted so that you had a hard time, with a sharp spear, penetrating a SS bale. If yours is adjusted like that your pressures may be higher.