does anybody know the propper procedure for determining stock length???? thanks for anything.

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I had a gunsmith cut down a rifle for my daughter. He had her to shoulder the gun and asked her if it felt like she was reaching around the stock. She was, so he cut off about 1". Shouldered it again, still reaching, cut off. It was the third try before she felt like she wasn't reaching around it. I was having a Decellerator recoil pad installed, so he removed an additional 2" and the rifle fits her perfectly. He had to move the sling swivel because it was now too close to the butt. He plugged the old hole with a nice wood plug and installed the swivel farther up on the stock. Whole process including the recoil pad was 75 bucks. I thought very reasonable. One question...are you trying to make this gun fit you and your wife? Anyway the gunsmith never measured the length of her forearm, I have heard of this, but I think it is an old wives tale.