I generally use plain card, similar to that used as a backing on pads of writing paper. For Whitworth I used a thicker stiff card reasoning on it creating a more robust scraper for the bore. Some use cereal box card and others felt. Some are just plain while other are lubed. I've never set about any systematic trials to see if one is actually any 'better' than another.

David

1/8" wool felt. Cut out with an arch punch. Source for wool felt is wwwdurofelt.com

Bob,

Peter Dyson will sell you a hex die for the Whitworth.  It's one you bang with a hammer.  I bought one and am happy with it, but I did have my gunsmith re-grind it to even out the plane of the cutting surface.  It will cut thick or thin wads of whatever material and really is no trouble to use.

Pat

New guy here. There seems to be no place to introduce myself so I'll just jump in. Clamp a 1/4 inch (7/16 head) bolt in a vice with the head projecting up a small distance from the jaws. Take a 7/16 arch punch and heat the cutting end red hot then drive it onto the bolt head. You have a hex wad punch that is perfect for your Whitworth bore. I have used one for years and and it has served me well.

I'm looking forward to spending time on this forum. I have a Whitworth and am thinking about getting a Gibbs.