I got a stainless 60 a couple months ago after a year or two of casual research.
First, good choice, you won't regret getting a 60.
Second,the majority of 60 owners, on multiple forums, seem to recommend the Federal bulk .22 from Wally world,as camoman just stated above.
Third, Remington bulk ammo is widely considered the dirtiest and most unreliable .22 bulk ammo around. I recently stumbled on a bunch that I'd put away a while back, and as expected, it was noticably inconsistent.
In bulk ammo, I and a couple freinds have been very happy lately with the Winchester bulk from Wallly World.
Also, keep in mind,lower velocity ammo is often more accurate than the higher velocity stuff. For instance,check out CCI standard velocity or Remington sub-sonics.
If you're willing to spend the money, there is a lot of better performing ammo out there : most anything from CCI,Eley,Wolf,etc.
Check out rimfirecentral for lots more info.