Hawkeye-
I've tried them all in my CZ, and it prefers the Rem/Eley ammo. FYI, there were/are only two companies loading 17 HM2 ammo - Eley and CCI. The Remington ammo was loaded for them by Eley, and the Hornady ammo is loaded by CCI. Until the recent addition of the "lead-free" bullets, all of the 17 HM2 ammo used the same bullet - the Hornady V-Max but with different colors for the plastic tips. I've heard that Eley has quite making their ammo but don't know that for sure. However, it makes me feel good about my purchase of 4 cases of Eley a few years ago!
If you can find the ammo locally, I suggest you bite the greenback, and buy a box or two. But recognize that some rimfires are very sensitive to even small changes from lot to lot...
FWIW, I got my 17 HM2 Eley ammo from Cathy Winstead-Severin at Good Shooting Sales and Service
http://www.goodshootinginc.com/index.php?ukey=home. Cathy is an Eley-sponsored shooter and one of the best small-bore silhouette shooters in the nation, and she and her husband, James run a neat mailorder shooting business. I just checked their website and it isn't showing any Eley 17 HM2, but you might contact Cathy to see if she has any leads on where to get the Eley 17HM2 ammo at a fair price. Another website to check is Rimfire Central
http://www.rimfirecentral.com ; the users of that website usually have a good idea of where the best rimfire ammo prices can be found.
Good luck!!
