I've shot the CCI and the Hornady, both 17gr. The Hornady is the redtip, and the CCI a HP.
They both shoot well, in my NEF Handi Rifle, I'd say they are about the same. Different POI, but they are each sub-moa. Actually, just about sub 1/2 moa.
That's the beauty of the 17HMR. There is no junk ammo for this chambering. All available ammo is the rimfire equivalent of premium match ammo. It's all loaded very consistantly, all with premium bullets, all very uniformly made. That's why they are $9 for 50. You really can't go wrong. I really haven't heard of people saying how their rifle likes X brand while Y doesn't shoot well. That is non-existant. But that just depends how you look at it. Before when the only ammo was the Hornady, some people got an MOA gun, others got a 1/4MOA guns..people just assumed that it was the luck of the draw on rifles (yeah, I know - how dissappointing for the poor bastard who got the 1MOA rifle
) While it might have been a difference in rifle quality within a brand or across brands, at least now there are more brands of ammo that gives people the chance to find one their barrel *really* likes.
This is nitpicking imo, because like I've said, the difference in quality from one brand of 17 ammo to another is almost nil. They are all made high quality. So your worst case scenario is shooting an ammo that the holes don't touch, and best case you make 1 hole. Remember, "doesn't group well" "my rifle don't like it" etc type statements in the 17hmr world are basically saying they are getting 1" groups at 100 yards instead of those 1-holers.
Oh the horror