Some interesting images
Monte Carlo, and no way could I rotate my hand like the fella in the foreground. Shooter in the background has a lower elbow and more anatomic grip

This is from the 1900 Olympic demonstration sport;
Grand Prix de le Exposition au Tir aux Pigeons, Cercle du Bois de Boulogne.
Lunden won with his straight grip, Mackintosh of Australia on right with a POW

Lunder appears to have elevated his right elbow and rotated his grip somewhat like the guy at Monte Carlo

Mackintosh with a more anatomic position grip
