It's hard to answer what bulk is best when you don't list nearly all the types of bulk.
I like first the Federal Champion bulk in the blue box of 525. I then like Winchester Dynapoints and the Winchester Box of 333. I'll then take the Winchester Xpert box of 550.
I shoot with iron sights and for me with bulk - I want it to go bang - I've had great luck with Federal 525 boxes of Champion bulk - not one fail to fire in my cz 452 and I've shot a few thousand - I've actually had a lot more misfires in a brick of fed 510 champion that I bought.
Federal is always my first choice of ammo, then Winchester, then Remington, if I go to Canadian Tire, they have Federal, if I go to Walmart they have Winchester - really I don't care as long as it makes some noise!