None the less PRVI Partisan 45 gr is available at a more or less normal price $(21 per box of 50), and Hornady 35 gr V-Max is also readily available and selling at amore or less normal price of about $15 per box of 25.
Accuracy of the 45 gr. PPU is mediocre but the 35 gr. V-max shoots very well in just about anything.
How many reloads can you get out of the PPU brass?
I never owned a 22 Hornet but many years ago had a friend that was a big fan of the caliber, both in a rifle and a TC Contender. He was lucky to get more than a few reloads out of the brass before the case neck would split. I was still reloading back then for financial reasons and like the caliber in the Contender so much I would have bought one of my own if it wasn't for the ammo being hard to find and the brass being so fragile.
One of the big drawbacks on the Hornet is the thin necks as you have witnessed.
I wonder if just neck sizing or partial neck sizing would change anything.
Absolutely correct on the thin necks. Pretty much all my hornet brass runs .009 neck thickness as compared to .013 for my .222 and others.
The hornet necks will work harden rather quickly from shooting especially top end or near top end loads. I have found annealing the cases for 3-4 seconds in a flame tip using a 1/4” deep set socket will help prolong case life.
I also use the Lee collet neck size die to minimize stressing the case but in my Winchester model 43 cases will stretch due to the construction of the action and I will get more incipient case separations than I do neck splits. This should not be an issue with a Contender.