A reasonable amount of dry fire rarely hurts a centerfire weapon- but snapcaps are cheap. Mix a snapcap in with a mag of live ammo to reveal flinching/heeling (when it do not go BANG) Brands? A-Zoom, Tipton's, Cabellas, etc. Visit your local gunshop, see what they have in stock. No shop? check Cabellas, Dicks Sporting Goods, Bass Pro, Gander Mountain, and Amazon.com.