Hi Stoney, I checked tractordata.com and it looks like the b7300 is very similar to the b7100hst, 0.7L engine, 16hp with 12.5hp at the PTO. From the specs a 36-40” wide tiller would be great. However those are harder to find than a 48” and they don’t cover the width of the tractor.
I have the TSC County Line branded Behlen made 48” tiller and it works great in hard clay. I don’t have many rocks, just hard Adobe quality clay soil. It comes with a slip clutch as well.