Interesting coincidence. I bought a girlfriend one of the original 3" Model 60's with the underlug in .38 Special. She felt the recoil with standard .38 loads was too snappy so she kept it loaded with Winchester factory .38 target wadcutters. Figured it was better to cut a clean hole center mass with a wadcutter than miss with something more powerful.

To the question, all I've ever used was the Speer swaged lead HBWC and they worked great in all of my .38's, I bought them by the 500 pack. I'd guess most anybody's HBWC would work well due to the design as long as they weren't "hard cast" which totally defeats the point of the hollow base. If you use a plain base or solid WC then you run into potential issues with proper fit since only the softest lead would obdurate well at the velocities you intend.

Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!