Why do you say limited? It will fire any pellet (and any brand) that fits the cylinders in its magazine wheel. Buy "fit" I mean that the correct caliber pellet does not protrude out the front or rear of the cylinder. If the pellet is too long then it will stop the magazine wheel from turning and the mag may get stuck inside the pistol.
All cheap pellet pistols are low to medium powered so trying to push out the heaviest pellets or slugs is counter productive.