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There are two reasons that I know of. The first is POI differences. Shooting from a solid rest and from the shoulder will give you different results. It is fine to do accuracy testing and load workups with one, but you must also shoot the gun from field positions to get used to the rifle and learn where it will hit when firing in the field. The rifle will recoil differently from a fixed rest, therefore hitting in a different spot. The second reason is putting a bunch of weight on the Lead Sled and shooting a heavy recoiling gun. If the gun cannot recoil properly, the stock must absorb all the force. This can crack the stock. This usually isn't a problem with normal guns, limited weight, and normal use.
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