You are the man, just don't hurt yourself
It is a great idea to use the Lead Sled to take the punishment. I have watched a lot of shooters during the Hunter Sight In Days almost crying firing their 12 ga slug guns. After 5-10 rounds through their shotguns they are many times unable to shoot any kind of a group to adjust their scopes or sights. They are anticipating pain coming at the pull of the trigger. I remember John Wooters as a fine author who detached his retna in his eye. I think heavy recoiling rifles were what was blamed for it. He was able to get it re-attached but due to his vison not returning after months he switched over to left eye/left hand shooting. I don't remember Craig Bottington another popular Guns and Ammo author every reporting on the dangers of recoil causing real injury.