I got tired of seeing less accuracy than my rifle has potential to produce, just to save a few pennies per reload.
When every shot is carefully aimed, it gets frustrating not to know if ones misses are the result of the shooter, the conditions, or the bullet.
Hornady 140 Amax is not expensive, a few cents apiece more than, say, bulk Prvi 139's. Those Amax's do shoot lights out though, 1/2MOA'ish in the better of my 6.5's. Prvi's go three times that, at best. Relatively inaccurate, relatively poor BC too. Why bother?.
With a really accurate rifle/reload combo .... the tendency is to shoot less rounds in a session. You've soon done what you came to do, wearing a big smile, and still lots of primo ammo left in the box for the next time.
Irony is, some of us actually save money by spending 10 percent more per cartridge..
To shoot casually, in volume, and really cheap too ... that 'cruise missile' mold could be the cat's meow.
Whatever floats your boat ... all 6.5x55 trigger time is golden.