Case design: The Ackley with it's shoulder is a much better mouse trap.
Case quality: Due to the thin cases, it doesn't take much to get the runout to unacceptable limits. Further, brass inconsistency with the small case capacity, leads to inaccuracy. You definately should turn necks to clean them up for concentricity reasons as well as consistent bullet grip. Weighing cases and discarding those with greater variations of .001 case wall thickness is a must.
Tighter than SAMMI chambers: Tight chambers are a must when dealing with such thin brass. You need a good custom reamer to closely match the turned brass. The further you have to move brass to resize the worse it will distort.
Good quality barrel and actions: Many hornets get their bad reputation from being chambered in smaller and many times cheaper actions. Get the best, true it, use a barrel from a top manufacturer and you are on your way.
Shoot the best bullets you can find. Weigh your bullets as small variations in weight equate to big variations on target using such a little case.
The same goes for powder charges as we all know.
Essentially, I find I am playing the benchrest game with this tiny cartridge.
Wow. That's all good to know I suppose, but I guess it depends on what one is going to do with the rifle. I just hunt ground hogs and other small varmints with my Hornet. It gets shot at paper to check the scope every spring (already been there done that for this year).
The following apply to my CZ .22 Hornet and .223 CZ American.
I've never weighed a bullet or a case for a Hornet. Never turned a neck. Never checked runout. Never bought a good custom reamer or after market barrel. I shoot unturned Winchester brass. Stick in whatever small rifle primer is in stock when loading them. I do shoot only 35g V-Max and 13.2g of Lil'Gun because they work every time.
I do weigh the charges although I'm not convinced that's actually necessry - one could pour the case full of Lil'Gun, wipe it off level with a finger, press in the 35g V-max seated out to where it will just fit in the magazine, and it will shoot 3 shot clover leafs and bugholes (it's a 3 shot group rifle used to kill one shot ground hogs - 5 shot groups are endless frustration - the first shot from a cold bore is what counts). I just load them in my CZ and go kill ground hogs. It's about a 200 to 225 to yard rifle with the 3-9 duplex scope on it - it's sighted 1" high at 100 yards.
I've never, ever, had a ground hog complan that I didn't have a custom barrel, turned necks, special reamer, pistol primer, or anything, 'cause they are DRT right after the bang (with so little recoil I get to see the impact). The entrance wound is almost always right where I wanted it to be.
I did pillar bed the action into the stock. I discovered Lil'Gun on my second load development experiment. That was the end of load development. That was about the extent of my fussing.
One of the beautiful things about this cartridge, at least in my little CZ, is how easy it is to use. Load a bunch of ammo - I usually load a couple hundred rounds at a time, last me 3 or 4 years. Shoot a foulers and two more in the spring to check the scope. Clean it in the fall after killing 25 to 35 ground hogs with it, repeat the next summer. I have 500 or so brass. As easy as Lil'Gun is on the brass that's looking like a life time supply.
If I had to play the benchrest game with my Hornet or my .223CZ it I'd sell them in a heartbeat. Life's too short to have to shoot bench rest ammo at ground hogs. I bought them to be walk around hunting rifles that are carried on a sling and fired 99% of the time from field positions.
The accuracy limit in the field is my ability to hold the rifle, not the rifle.
I like the CZ Hornet and the CZ .223in large part because they are such easy keepers and shoot so well with so little fuss. Aim, fire, game drops dead, savor little spurt of pleasure from successful shot, look for next one. It's a great way to hunt. Work real fine, last long time, no muss, no fuss, hit what you aim at. Lot to like about that.
Fitch