American Rifleman - August 2017 - 45
Introducing the Agile™ Model 52 from SecureIt®
"We just moved. I sold my
gun safe. My wife said 'you're
never buying another.'
She is right! The Agile Model 52
is amazingly rigid and strong."
- Jeff Allison
This measurement is the headspace
allowance for this cartridge.
which a cartridge may no longer
move, and corresponds to a position on the cartridge. For purposes
of uniformity (and thereby, safety),
specifications have been established
for both firearms and ammunition to
assure function and safety. Because
absolute dimensional perfection is
unobtainable in manufacturing, there
are tolerance limits allowed for both
gun chambers and the ammunition
to fire in them. An excessive headspace condition can exist because the
ammunition is "undersize."
See the cartridge illustration for
the .30-'06 Sprg. nearby. The headspace dimension for the chamber
is from the bolt face to a point on
the shoulder where the diameter
is 0.375". It is allowed to be from
2.0487" to 2.0587", a difference of
0.010". Gauges are available to determine whether the chamber dimensions fall within that range. This is
an "ideal" range, safe and functional.
Extreme variations can be dangerous.
Excessive headspace conditions in a
rifle can be accommodated by certain
reloading techniques, as long as an
excessive unsupported case situation
does not exist. While "fire forming"
can apply to longitudinal dimensions,
it also is a feature of radial expansion.
-JOHN TREAKLE, CONTRIBUTING EDITOR
Think of it as
The Ultralight Gun Safe!
It does what a gun safe does without
being horribly heavy or hard to move
Learn more at
6691 Commerce Blvd., Syracuse, NY 13211 | 800.651.8835
(Can be bolted down)
T R E AT YO U R S E L F
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and the .44 Mag. of today. The short
answer is that the 16" guns had a chamber pressure of 18.5 tons-per-square-inch
(t.s.i.). For direct comparison, we should
have converted that to 37,000 poundsper-square-inch (p.s.i.). We apologize for
that and for other errors that crept into
our condensation of the original answer.
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