Now that I've seen .22lr on shelves and I've even bought some ammo. I got a few different brands because I want to test my firearm to see if it "likes" any brand best. Looking into how people do this I've seen several different methods: 10 shot groups, 5 shot groups, 50,75,100 foot distances, slings, lead sleds, sandbags and more.
What's your preferred protocol for testing ammo preference in a new rimfire gun?