I tried the tape method on my first job and wasn't careful enough to avoid going through it in spots. I bought a jig like the B-Square sold by Brownells and have not tried to do one on the gun since, except an unfinished stock. With the jig you can scribe the butt outline or put tape on the front of the pad and cut the stock outline with a sharp exacto knife. Then grind the pad to just touch the edge of the white tape. Whether it's exactly perfect or not, you don't screw up the stock finish. Works for me.
