| The Goal:
Build a Glock that is
radically more accurate than stock, doesn't sacrifice any of its
legendary reliability, and can be had by the average shooting enthusiast
without retaining a master gunsmith or enduring months long waiting
lists.
Proposed path to goal:
Reduce the bullet-jump in the barrel to
near-zero producing potential accuracy increases due to better bullet to
bore alignment.
Definitions:
(These may not be "industry standard" definitions, but are
defined for purposes of this project.)
Chamber - That portion of the
barrel that contains the cartridge case inclusive of the barrel hood and
ending at the head spacing step.
Head spacing step - The step on
which the case mouth rests to index the round in relationship to the
free-bore, throat, and main bore.
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Free-bore (aka. "lead")
- That portion of the barrel bore having no lands, specifically from the
head spacing step to the beginning of the throat.
Throat - That portion of the
barrel bore from the lead to the main bore where the lands begin and
ramp up to full height at a given throat angle.
Throat angle - the angle at which
the lands ramp up from free bore diameter to full height, typically
expressed as twice the single-side planar angle (e.g. 1.5 degrees per
side of a cross-section x two sides for a total throat angle of 3
degrees).
Main bore - That portion of the
barrel from the end of the throat to the muzzle characterized by full-height
lands.
Bullet-jump - That distance the
projectile must travel from its original position as seated in the case
to the point it first engages the barrel lands.
Note: Click on most images for a
larger version.
And
then? |
