The splits are strictly poor reloading practices, unless you have an almost unheard of loose neck in the chambering of your gun, but I would bet heavily against that. Easy way to tell is shooot some factory through it, if they don't split it is the poor reloading job. I would throw out the brass from this guys reloads and start with fresh, preferrably Privi or second choice, Winchester brass. Try to stay away from Remington on Hornet brass.
I shoot 5 Hornets, brass usually last 15+ reloads per case, though I have one gun that has a looser neck and they usually last about 12 or 13 loads, all with with no annealing and neck sizing only. I keep the brass in well marked plastic cases and ALWAYS shoot the same brass out of the same gun.
All 5 shoot exactly the same load, 12.6 grains of Lil"Gun, thrown with a Lyman 55 and not weighed individually, Fed Small Pistol Primer, and a Sierra 40Grain Blitzking set at 1.81 LOA. Worst one groups this at .6 at 100, a couple will do considerably better than that. Good luck with the new gun, it is probably my favourite small caliber. They are a blast to shoot. If you want any other info on the Hornet feel free to PM me.
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