"You've got to hit point-blank and you've got to hit it in the ass ..."
The M36 was well-liked by its crews, being one of the few armored fighting vehicles available to US forces that could destroy heavy German tanks from a distance. Corporal Anthony Pinto of the 1st Platoon, Company A, 814th Tank Destroyer Battalion knocked out a Panther at 4,200 yards. Another 814th gunner, Lt. Alfred Rose, scored a kill against a Panther at 4,600 yards, the maximum range of the telescopic sight. However, the Panther's 82 to 85mm thick glacis plate[5] could deflect certain shots from the 90 mm gun at just 150 yards, and the 150mm thick front armor of the Tiger II could only be penetrated in a few hard-to-hit places.[6][7] By the end of 1944, seven tank destroyer battalions had converted to the M36. The M36 had mostly replaced the M10 by the end of the war.
The M18 was the 76mm version. Any solid shot will get deflected at the right angles.
It would be easier to kill it at 3,000 yards rather than 150 yards.
For a Tiger II, you would almost be better off with an HE round for a front shot and hope the trauma disabled the crew for a while.
"You've got to hit point-blank and you've got to hit it in the ass ..."