I forgot to tell you, the rules for rifles do not allow bipods or any attachments to the stock in the light gun class.
No attachments to stocks such as but not limited to guides, slides, rails, blocks ect.
You can shoot prone with a front adjustable rest and sand bag or shoot from the bench in the light gun class which is up to 16 1/2 Lb.---Max muzzle diameter of .950"--max stock width of 3". Brakes are allowed in the light gun class but not the heavy guns.
That's about the way it is in the Heavy guns with a 100# limit. There are rules there too but not barrel tapor or no attachments to the stocks which ARE allowed.
The Light guns were set up many years ago to put everyone on the same playing field to start with. The class has grown rapidly and everyone has built guns to suit the rule structure.
It has worked for us at Williamsport and we are the oldest and largest 1000 yd club in the World.