I had to take a bit off of the hammer on my gun also. I used a weaver mount intended for a regular Handi Rifle and regular Weaver rings. I wanted the scope to be as low as possible over the bore of the gun.
I had counted on having to remove material from the hammer to accomplish that, so I wasn't suprised when I had to.
I liked the weight of the Tracker II and the cheaper cost compared to a Ultra, and mine will hold a 2" group at 100 yards using the Remington's. I tried the Winchester Partitions, but they just weren't as accurate as the Remington's. I'm interested in trying the Remington Bonded bullets sometime, but it was sighted in for the Coppers, so that's what I went with this year.