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Rimfire Bull Barrel Question

Discussion in 'Rifle Country' started by cat_IT_guy, Jul 23, 2007.

  1. cat_IT_guy

    cat_IT_guy Participating Member

    May 9, 2007
    Metamora Illinois
    I a fellow THR member posted the following recently:
    Is this true? If so, please explain why. So this would mean my .17HMR and .22 with bull barrels are no more accurate than if they had sporter barrels, assuming that both were held completely still?
  2. R.W.Dale

    R.W.Dale Elder

    Oct 14, 2005
    Northwest Arkansas
    Unless you do enough shooting to get the barrel hot, which takes A LOT of rounds with a rimfire. just cause the barrel is heavy doesn't mean it'll be accurate. I've seen way too many great groups fired through sporter barrels just as I've seen bull barrels that don't shoot worth snot. My CZ 452 american in 17hmr would shoot circles around my buddies bull barreled savage in the same caliber. The barrel profile and harmonics are a VERY small part of the variables to take into account to make a rimfire accurate or not

    Rimfire rounds simply do not generate the forces to take advantage of a bull barrel like a centerfire does

    you got it! You just end up lugging a heavier rifle through the woods for no reason.
    Last edited: Jul 23, 2007
  3. hksw

    hksw Senior Member

    Dec 25, 2002
    IMO, sporter and bull profiled barrels should perform identically or nearly identically given that they are from the same manufacturer when cold, cool, or even warm. (Variations between manufacturers could give an advantage to one barrel over the other no matter the profile.) Where the bull really shines is when the barrel gets hot. The tendency to warp (very minutely) is less with the thicker bull barrel than the thin simply by the amount of material. The more the material (of the same composition) the less the deflection when heated. THere is much more material the warping force has to overcome.

    To compare the barrels of one manufacturer of a particular profile against another's of a different profile has, again IMO, very little to do with the profile. It is mainly due to the build of the barrel (chamber dimensions, rifling dimensions and specifications, etc.) It is said that the CZ barrels outshoot a lot of the other manufacturers' barrels because of the bore dimensions. The muzzle end of the bore (being hammer forged) is tighter or just the right dimension as compared to the chamber end. My CZ sporters do outshoot cheaper (i.e., Butler Creek) bull barrels but they also outshoot sporter and semi-heavy barrels from other manufacturers. (A very good inexpensive bull barrel that slightly outshoots my CZ sporter barreled guns are the Green Mountain barrels.) Agains my CZs with heavy barrels (Varmints), the sporters shoot about the same.

    Another big factor is ammo selection.
  4. NOOk

    NOOk New Member

    Jul 22, 2007
    Good thing you came back for a second opinion. HKSW is right on. It helps the barrel lose heat faster and lowers the effect of barrel harmonics. Your barrel 'whips' to a small effect as the blast forces travel down the barrel. See the shooting times guide to accuracy, page 121. ( still on racks in some bigger magazine outlets)
  5. quicktime

    quicktime New Member

    Jul 23, 2007
    Currently in Kabul Afghanistan but usually Colorad
    Last edited: Jul 23, 2007

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