The advantage of using a lower power factor is that the recovery time between shots is faster. Those shooting with compensated guns often prefer a higher velocity, lower bullet weight combination for the same level power factor because the compensators work more efficiently at higher velocities. You CAN use 200 grain or lighter bullets at high velocities but the likelihood of deadwood goes up. You CAN use really heavy bullets at low speeds but this is discouraged be- cause the heavies poking along in the low 800's are much more likely to bounce off the pins instead of penetrating them. Revolver is shot using about any legal revolver.
Stock is shot with any stock gun.
If shot with a semi-auto you can have 8 rounds in the gun. Thus, a Desert Eagle .44 magnum is NOT considered a stock gun. Often shooters compete in this class with the same revolver they use in the revolver class. Full auto is NOT allowed. There is no weight limit or barrel length limit.