I think those grips are made by Excalibur (Hogue doesn't offer that kind of wood in their lineup.) They are not relieved, but I was able to use my HKS speedloader just fine.
The ones for the Taurus small frame are called the "Silver Black Boot Grip", and the Jetfire ones are the "Silver Black Standard Panel with palm swell". They were around $50 each.
They carry them over at gunaccessories.com at the following link:
http://www.gunaccessories.com/Excali...rips/index.asp