RE: Boresighting a muzzleloader??
Bruce,
No, you probably don't want to use those. Those are for cleaning.
The ones I have used are round and yellow. Gander usually has them but might have run out. you could take the cleaning patches, cut a smaller circle, and prelube them with bore butter, which I believe the round yelllow ones are lubed with anyway.
Try another hunting shop. My local hardware store sells them, as well as the powerbelts, and round balls. Usually you can get 100 round balls for about $8. I use to shout round balls before I found the pleasure of shooting powerbelts.
Tom