Often electronic scales can be thrown of or give error from being to close to the wall where electricity is running by it. Not saying this is the case but it happens often. My guess is that its somthing simple your over looking. Id call RCBS before sending it back they might beable to trouble shoot it over the phone.
Have you even looked in the instruction booklet to see what that error code stands for and what to do when it comes up? According to the one instruction book I brought up online it says that it stands for out of calibration and you need to exactly follow the instructions for recalibrating it. I can't remember the model it was for, but I think that is probably what yours needs to have done. If you don't have the instructions, you can just do a search for that scale and download the thing onto your computer and go from there. Let us know what you come up with and if that fails I guess you can always call the company if you haven't already..
Others have offered up a sighting of roughly 2 inches high at 100 yards as a good sighting scheme. In my own experience I have come to favor a sighting of 3.5 inches high at 100 yards. This allows for the individual to hold dead-on (directly in the middle of the top and bottom) the animal out to roughly 350 yards.
Magnum calibers such as the 7mm Remington and 300 Winchester will extend this slightly. At 400 yards I hold directly on the backbone of the animal. The drop at this range allows the...