The rifle barrels in drillings are generally very accurate because teh two shotgun barrels help stabilize the rifle barrel, reducingh the impact of barrel harmonics. However, the walls of the rifle barrel is fairly thin and the barrel heats up quickly and is restrained by the cooler shotgun barrels, ruining accuracy after a few shots. Same thing happens with double rifles. With both, you have to wait for the barrels to cool to shoot accurately. There are hunting guns so that isn't a problem in hunting use.