axis of the bore

axis of the bore

[′ak·səs əvthə ′bȯr]
(ordnance)
The imaginary central line of the bore of a gun.
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References in periodicals archive ?
Unless the base of that bullet is perfectly square to the axis of the bore, gases begin to escape past one side of the base a tiny fraction of an instant before the rest.
The Rundown on Runout: A SIMPLE TEST SHOWS HOW RUNOUT CAN AFFECT THE ACCURACY OF YOUR ROUNDS
This changes its position and the orientation of the bolt face to the center axis of the bore.
AR-15 Bolt Carrier Tilt
If we're not loading directly down the centerline axis of the bore, our off-axis pressure will combine with PIV to make our crosshairs hop off our point of aim.
Accuracy testing, Pt. 1
Many have criticized this feature, claiming a short neck would not hold a bullet in proper alignment with the axis of the bore.
The .300 Win. Mag. cartridge: 50 years old and still going strong
With a 1911, the axis of the bore sits lower to the hand than many of the more modern guns it competes with.
Shootability factor
Since the Foster slug is almost as wide as it is long and considerably smaller than the bore to boot, it may or may not perfectly align itself with the axis of the bore during firing.
New twist: a design before its time is worth a look for modern slug hunters
Usually, though, most of the weight (stock, receiver, magazine, lockwork, triggerguard and floorplate) is below the axis of the bore. The result is muzzle rise, further increased when pressure of the stock against our shoulder keeps the rifle from moving back freely.
Recoil management: how you hold makes all the difference
Good gunsmiths like Weigand carefully machine the crown square with the axis of the bore and ensure that no little burrs or other deformities are present.
Questions & answers
Mechanically driven parallel anvils extend simultaneously, and their consistent pressure results in more accurate readings and true alignment to the axis of the bore. Linear accuracy to .00015" (0.004mm), capable of measuring from .08" (2mm) to 12" (300mm).
Bore gage
The bases of bullets seated with run out will not be perpendicular to the axis of the bore, causing tipping upon exit.
Better ammunition: no matter how proficiently the gunsmith performs his work, no gun will shoot bad ammo well enough to win
Add to that the straight-line stock design, which puts the shooter's shoulder in direct alignment with both the recoil axis of the bore and the linear axis of the gas-impingement, minimizing muzzle flip and subjective recoil.
AR accuracy: the benchmark: precision shooting is easier to obtain-and maintain-with the Stoner setup than with anything else

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