I once weighed my standard 629 4" and 629-4 Mountain Gun. My notes say I had a Hogue wood grip on the Mountain Gun (which I don't recall
) and magnas with a T-grip on the standard 629. There were exactly 3 oz (about 8%) difference between the two.
I couldn't agree more that in general one might give it another thought before putting too much emphasis on the weight savings of the Mountain Gun. The standard gun is both easier on the shooter and easier to shoot more precisely, in my opinion. The 329PD is another matter. There is a lot of weight savings there - it's almost 36% lighter than the standard model, and it feels like it when you fire it.
The G20 is going to be almost exactly the same weight as a 329PD. Loaded, the G20 will weigh what the 629 Mountain Gun weighs empty. If you like the thing, the weight and capacity factors are there. At close range, so is the accuracy. Whether one considers the 10mm to have sufficient power is another matter.

I couldn't agree more that in general one might give it another thought before putting too much emphasis on the weight savings of the Mountain Gun. The standard gun is both easier on the shooter and easier to shoot more precisely, in my opinion. The 329PD is another matter. There is a lot of weight savings there - it's almost 36% lighter than the standard model, and it feels like it when you fire it.

The G20 is going to be almost exactly the same weight as a 329PD. Loaded, the G20 will weigh what the 629 Mountain Gun weighs empty. If you like the thing, the weight and capacity factors are there. At close range, so is the accuracy. Whether one considers the 10mm to have sufficient power is another matter.