Turns out I cant read. I was mistaking the diameter for the depth they wanted me to drill.
I have a synthetic stock, when I drilled into the butt, there was not much before I drilled thru the plastic to the inside, but there is some sort of sticky goo inside. Im wondering if thats intentional so bind up the \swivel screw when you screw it in. Anyways, I have my swivels and can now throw a strap on there.
The kit came with 2 swivel screws (1 front and 1 back) plus a barrel band swivel. So I used the barrel band and the rear, but I also installed the front on on the side of the stock just behind my trigger hand so I can use a tactical harness if I wanted. Just for kicks.
Cheers