If I was a more sensitive person you would hear that I was appalled by various ammo/component companies abandoning some cartridge after aggressively promoting it - .300 RSAUM, 7mm RSAUM, .223 Win SSMag, .243 Win SSMag, .257 Win SSMag, .17 Mach2, .17 Rem, .300 RCM, .338 RCM, .307 Win, .30 Rem AR, 8mm Rem Mag, and possibly more. At least there was a good reason they quit major production of the 6.5X50 and 7.7X58 Japanese. It is possible with some effort or expense to get brass for these rounds but commonly they are not an easily available commodity. Having no .17Mach 2 ammo might require a re-barrel job to .22 LR. All initially good ideas but ultimately economic fizzles. In addition, I would be unhappy to lose some 25-50% of my AR ejected .22 Nosler brass in the weeds while shooting varmints.