Yep, the action wrench has more surface area and a provision for the front action screw to keep it from spinning. The Wheeler action wrench also has a notch to key the recoil lug.

I've had a couple tough Savage nuts and a couple tough remingtons, but nothing was as tough as an old Mauser of my buddies.

I had the action wrench cinched up in my vise while I was putting all my weight on a 3' pipe wrench on the barrel. A few bounces with my feet off the ground popped it loose.

Billpa had a great setup that located the barrel, action, and nut wrench all on his bench. All he had to do was tug on the action wrench without worrying about supporting anything else.