Who had the heaviest bat and what is the weight?

it really depends on your governing body in usssa slowpitch you can use up to 31 ounces legally some people get by and use heavier bat but unless you are built like a gorilla a heavier bat is going to have a negative effect on your bat speed. You ideally want a medium, middle of the road bat weight of 26 to 28 ounces so you can get a quick bat onto the ball