No need to do anything to switch to the Fed Walmart Bulks. In fact, these burn so clean that I often use them AS a bore cleaner after shooting lots of dirty lead bullets in one of my .22s.
The Fed Bulks are very reliable and clean, but not especially accurate.
Standard .22 twist is 1:16. Most .22 ammo you buy will be between 36 and 40 grains, and the 1:16 twist handles these all just fine.
The rule for finding good .22 ammo for plinking, practice, and paper punching is: Start with the CHEAPEST ammo you can get (unless that's Remington Thunderbolts, which you want to stay away from) and work your way up in price, stopping when you hit the level of accuracy you think is worth the price you're paying. This might come very far down the line, or very far up.
If your Walmart carries Winchester Dynapoints in .22LR, give those a try--they're very accurate in all my guns. Some Kmarts have them, too.