My guess Probably finger tips not palm or knuckles.

I have never used a palm rest - I use a more modern version of a Schuetzen rifle.

I balance the forearm on my extended two fingers under the forearm and extended thumb under the lever.

That provides a perfect weight balance on my rifle where there is equal weight in front and behind my hold.

I designed the amount of wood on my forearm so that I have the perfectly level elevation when I hold it that way so the barrel is perfectly horizontal.

If I have to shoot uphill or downhill I put a 1 inch thick board under my front or back foot to get my barrel aimed without putting tension on my hold by trying to hold it higher or lower.

If you note in the picture  the forearm is stepped down in the front to shoot off the benchrest whereas the thicker backside is designed for perfect elevation for my finger hold.

I also shoot traditional German schuetzen rifles. These rifles have much lighter barrels, so the balance point much closer to the action. I shoot with my offhand palm up under the massive lever or just ahead of it depending on the rifle. Palm rests just don’t feel natural to me. I don’t shoot competitively other’s advice might be better.
Mike

A dedicated German rifle offhand shooter would have a buttock implant added to his/her hip so that the elbow could rest on it. If you are considering having it done, make sure they locate the implant on the correct side. Right hand shooter, left hip. Left had shooter, right hip. Okay so you're going to look like you have three buttocks. Looks are only skin deep. 

Reminds me of that joke where Bob had two buttholes. I'll save that for another thread. 

Oh what the hell....



Stanley died in a fire and his body was burned pretty badly.

The morgue needed someone to identify the body, so they sent for his two best friends, Cooter and Gomer.

The three men had always done everything together.

Cooter arrived first, and when the mortician pulled back the sheet,

Cooter said, 'Yup, his face is burned up pretty bad. You better roll him over.'

The mortician rolled him over and Cooter said, 'Nope, ain't Stanley .'

The mortician thought this was rather strange.

So he brought Gomer in to confirm the identity of the body.

Gomer looked at the body and said, 'Yup, he's pretty well burnt up.

Roll him over.'

The mortician rolled him over and Gomer said, 'No, it ain't Stanley '

The mortician asked, 'How can you tell?'

Gomer said, 'Well, Stanley had two assholes.'

'What? He had two assholes?' asked the mortician.

'Yup, we never seen 'em, but everybody used to say:

'There's Stanley with them two assholes.'