I have to agree with Both Wyobull and Rock Knocker I have a friend that has a Lead Sled and we did use it before. It saved the shoulders for the lighter kicking rifles. I use a Bipod and Bag, or even two bags depending on the rifle. If possible read the link about Froggy. I have known about him for a long time and read that article a couple of times. A few things to remember if possible is to get that rear bag under your cheek so that pressure is even and correct. Its sort of like three point VS two points of pressure. You can even use a dryer sheet, between gun and bag, to allow the gun to slide a little if you are using two bags. I have found something that (Bench rest shooters) some shooters use and that is to bring your own stool out to the range IF, it is adjustable. This places you in a much better position for shooting rather than a one size fits all deal. Such as some plastic chair provided by the range. Do you have to get Fancy? No, I have a 4"X 4" with a piece of plywood screwed to one side and I set my front bag on it. Using the dryer sheet if necessary, so bag does not want to topple so easy. I have a couple of extra pieces of plywood so that I can get my rifle as level as possible with the rear bag placed were it needs to be. Heck I have seen guys buy bags of lead shot. Sinclair INTL sells some good bags. Set things up as best as possible so that you can tell the potential of the rifle and load.
I tried doing this also, so that I do not get worn out, or waste money, time, and components. Instead of shooting a ladder load I try to get the optimum weight charge, and just shoot one bullet of each load. Aim at the center and mark each shot. This can tell you where the load is going to be and then you can load up 5 rounds. If it still looks promising, then you can play with the COAL. But this all begins with good bags or good bipod and rear bag.edit Rifle needs to be sighted in already to do this.