I have a ream of 25% cotton onion skin from the paper mill store. Here is the problem. The link Slow Burn has posted is 100% wood fiber. No cotton was used in this paper. I am not saying it is bad. I am saying I have not used it and it is not cotton. The paper mill store quit carrying the 25% 9#. I don't know why but they did.

I wrap mine on dry and size it to .501 this presses it on and it stays on very well. Soaking with water is another step that takes more time to do. Wetting is not needed if you making the Lee 500S&W bullet and your planning to size with the lee sizer.

Sharpsshooter, What is the thickness of that paper? That 24# paper is going to be seriously thick.
If flounder wants to use the 24# he is going to have to size the bullet down before he wraps and probably the bullet after it is wrapped too.

flounder, if you use paper other than cotton 9# the info I give you will probably not work. The info I give is for 9# onion skin 25% cotton. When wrapping paper on bullets thickness of the paper is a BIG part of the process. The paper thickness, bullet diameter, and the bore, and hardness of the lead all make up what works in a particular rifle. I personally think that the paper patched bullets made the way I do it would shoot very well out of your .504 rifle. Ron