The pipe insulation foam was what I was trying to remember. Inventor/airgunner reported that it worked well. Me, I'm going to sashay around with my waxed leather Wilkins pouch. Got to find a tweed shooting jacket now and maybe one of those hats with the little fur brush, too. And Johdpurs with riding boots. Must look the part to go with the fancy pouch now, eh, wot? One plus on the larger Wilkins pouch - works for rimfire ammo, too.
Why not one of these...http://www.sportsmans-depot.com/products/Phillips-Pellet-Holder%2C-.177%252d.20-Cal%2C-Holds-20-Rds%2C-.325%22-Thick.htmlCan get one to wrap around the stock or scope or the wrist as you see here. Probably could make your own as well.