The Rifle
    Rifles are considerably more leathal than pistols, to the extent that they are often not included in discussions of firearms lethality, because their capabilities are almost a given. Rifles have several advantages over handguns

    Rifles are meant to be held rather than carried, and are shoulder fired weapons rather than being fired using the hand as a platform. They are thus longer, heavier, and can be more sturdily built.
    Cartridges desigend for rifles do not have the same constraints as those meant for handguns.

Conclusion
    A rifle is more leathal than a pistol by a whole magnitude of order. If leathality were the only factor considered in firearms design, there would be no pistols, only rifles. A pistol is comprised of a series of compromises designed to make it concealable, and handy to carry. Most rifles are not so hampered.