While I do not have a Charger I do have a long barreled Buck mark with the forend.
After seeing a picture of a Marine sniper in a kneeling position with his left arm on his left knee and had with the rifle on his left arm and he was holding onto his right wrist.
For a while I had a Scout scope on the Varmint model and I would rest the fore arm of the pistol over my left elbow and grasp my right arm with my left hand. Using a modified position I saw the sniper using. Then for a while I had a red dot on the gun and that too worked.
Now it only wears its iron sights.
With the Buck mark I worried about the slide hitting me and set up the Scout scope so it was not in focus unless i was far enough back.
With the Challanger you do not have this problem as it has a captured bolt.
OH with the short rifle I was shooting in events against guys with scoped rifles and holding my own. I found the crossed arm position was stable, fast to get on target and easy to shoot. If you have a Red dot or a medium focus scope, it may work for you.