How long brass will last depends on how hot they are loaded, if they are crimped or not, if neck sized or full length sized, and the case itself (design). A 22 Hornet case usually will stretch just above the web and will fail there first; they will need to be trimmed often too. This is due to the design of the case. Along sloping shoulder will let the brass flow to the case mouth. This growth comes from the area just above the web. A 22K Hornet will act more like a regular straight walled case with a sharper shoulder. Most other bottle neck cases will fail in the neck first, but if they are full length sized each time, can fail just above the web. Cases that fail just above the web, usually need more trimming done. This is because the case growth comes from that area, just above the web and the brass flows forward into the neck. This growth needs to be trimmed occasionally. Straight walled cases usually fail in the case mouth first due to case mouth flaring and crimping. You can extend the life of a case by annealing the mouth-shoulder area; if the case is going to fail in that area. Keep you brass in lots, when you notice a few cracks in the neck, you can anneal them to extend the life of the remainder of the cases. If it is going to fail just above the web, there is nothing you can do about that to extend it's life. When you see a few that have impending failure here, just toss the lot; it will not be long before they all will show signs of failure. Bottle necked cases that are neck sized only and only bump the shoulder back as needed usually do not need trimmed as often and do not stretch as much in the web area as cases that are full length sized. There is no correct answer for how long a case will last; it will last until it fails. There are methods to extend the life of a case, one I mentioned above, but in some cases you have to full length size every time. Some semi-autos need to be full length sized for reliable feeding, in some hunting situations, you want to full length size for reliability, and some want to shoot ammo in more than one firearm so they full length size so it will fit in every gun. When you neck size only, it is for a certain gun. And to get maximum life out of a case you only bump the shoulder back (not full length resize) enough to reliably chamber your round, maybe every third or fourth reloading. Straight walled cases, just shoot them until they start failing in the case mouth and anneal to make them last even longer. Welcome to the wonderful hobby of reloading. Good Luck and Good Shooting
