I've been buying round bales for awhile now, and I've found that everyone selling round bales, lies about what they weigh. A guy on YouTube took one 4x5 round bale to the TXDOT Scale and had his trailer weighed with the bale, and without the bale. Actual weight of a tightly rolled bale was just over 700 pounds. Say 750 for easy math.
I agree with everyone else that you are better off removing the bucket and getting a proper hay spear. I have two tractors with hay spears. Both are the double spear designs. They work great, but I've never used any other type.
I also have a 3 point spear for my smaller 37 hp tractor without a loader. I use it when the other tractors are broke down and I'm desperate to get a bale out. I can pick up the bale and bring it into the pasture, but I can't get it into the cradle, so I just unwrap it and leave it on the ground. It goes twice as fast without being in the hay cradle.