Mauser06 this is the site where I got the Hollow Hole Punches.

http://www.brooklandsales.com/products/index.html

the 1/2 inch punch will make the bore buttons for a .50 caliber. And the felt I buy at a Hardware/lumber yard. It is the gray felt strip that we tuck around the doors and windows and push into cracks.....

When you shoot concials if you want to try some,

http://stores.ebay.com/blackjackhillhuntingandfishing

take and look at his site. You can buy them there and he even pays the shipping. Bill's quality is real good. You would want to look into a .50 caliber 250 grain REAL or a 320 grain REAL. I think you will find the 250 grain might work the best out of the slower twist.....

And your right it is a good way to spend a day inside when you can't get out.....