Shooting Sports USA - January 2018 - 19

they would. Though it might
appear that annealing could be
a substitute for match prepping
cases, that is unsubstantiated
without shooting many, many
more groups, and no one has
ever made or now makes that
claim. Still, it's an interesting
comparison. From this tiny
sampling we note that it appears
we can reload 3 MOA factory HXP
76 to make sub-3 MOA groups,
but even 2 MOA is probably not
small enough to detect whether
annealing shrinks groups. The
only further confident conclusion
we can make here is that we need
more data to make any further
confident conclusions.
Again, this was a test conducted
out of simple curiosity, which is
one of the reasons we handload,
yes? Shooters all over the
planet utilizing more precise
rifles and handloads and firing
over longer distances have
contributed mountains of data
and testimonials indicating the
AMP annealer does, indeed,
shrink groups by providing more
consistent neck tension on bullets.
Better yet, the AMP moves
annealing from, "Oh, brother" or
"It ain't worth it" to, "Sure, I've
got a few minutes."
For more detailed information
on the AMP annealer, visit
www.ampannealing.com. The
AMP annealer is available from
Brownell's for $1,099.99. *

W

ANNEALING OPTIONS

e ask brass to perform two somewhat disparate
duties: it must be soft enough to expand and
seal the chamber like a gasket to force high pressure
gases forward, and then collapse after firing to not
grip chamber walls; yet it must also be strong (hard)
enough to resist being overpowered by those gas
forces, to firmly hold a bullet, permit rough handling
and facilitate easy chambering and extraction. A brass
case gets sufficient strength from its 70/30 copper/zinc
composition and being "work-hardened" into shape
from a slug. Annealing the forward portion of the case
in the neck/shoulder area re-softens the brass, allowing it
to perform its gasket duties.
Annealing done wrong can cause a cartridge case to
fail when fired. We want to confine annealing to the neck/
shoulder area, and we absolutely must not soften a case
further back, which could cause a case head separation,
or worse, a full-on failure resulting in a ruptured cartridge
rocketing high pressure gases rearward.
Brass anneals between 650-700° F. Given time for the
grain structure to "grow" (soften); annealing can occur in
less time at a higher temperature. We can reach almost
2,000° F with a common propane torch, and isolate
annealing to the neck/shoulder area by standing up cases
shoulder-deep in water to protect the rest of the case from
heating. A smear of Tempilaq gives a visual indication
when temps have reached 700° F. This technique is
adequate for extending case life, but it lacks the time-totemperature consistency needed for adding annealing as
a step in reloading ammunition of utmost precision.
Clever inventors have introduced several different
machines that rotate cases under a propane flame for
more uniform annealing. The Bench-Source annealer
rotates cases on a horizontal plate under one or two
propane flames and runs in the $500 neighborhood. The
Annealeez automatically feeds cases vertically through a
flame, costs under $300 and utilizes camp-style propane
bottles. Along with the AMP annealer, they give us more
options in price points and methods for annealing.

SSUSA.ORG | JANUARY 2018

19


http://www.brownells.com/gunsmith-tools-supplies/metal-prep-coloring/heat-treating-accessories/tempilaq--prod13124.aspx?avad=avant&aid=33499&cm_mmc=affiliate-_-Itwine-_-Avantlink-_-ale&utm_medium=affiliate&utm_source=Avantlink&utm_content=NA&utm_campaign=Itwine http://www.bench-source.com/id81.html http://www.annealeez.com https://www.ampannealing.com http://www.brownells.com/reloading/case-preparation/case-annealing/induction-annealing-machine-sku749017419-104413-201314.aspx?cm_mmc=cse-_-Itwine-_-shopzilla-_-749-017-419&utm_medium=cse&utm_source=connexity&utm_campaign=itwine&utm_content=749-017-419 http://www.SSUSA.ORG

Table of Contents for the Digital Edition of Shooting Sports USA - January 2018

In This Issue
Shooting Sports USA - January 2018 - Cover1
Shooting Sports USA - January 2018 - Cover2
Shooting Sports USA - January 2018 - 3
Shooting Sports USA - January 2018 - 4
Shooting Sports USA - January 2018 - 5
Shooting Sports USA - January 2018 - In This Issue
Shooting Sports USA - January 2018 - 7
Shooting Sports USA - January 2018 - 8
Shooting Sports USA - January 2018 - 9
Shooting Sports USA - January 2018 - 10
Shooting Sports USA - January 2018 - 11
Shooting Sports USA - January 2018 - 12
Shooting Sports USA - January 2018 - 13
Shooting Sports USA - January 2018 - 14
Shooting Sports USA - January 2018 - 15
Shooting Sports USA - January 2018 - 16
Shooting Sports USA - January 2018 - 17
Shooting Sports USA - January 2018 - 18
Shooting Sports USA - January 2018 - 19
Shooting Sports USA - January 2018 - 20
Shooting Sports USA - January 2018 - 21
Shooting Sports USA - January 2018 - 22
Shooting Sports USA - January 2018 - 23
Shooting Sports USA - January 2018 - 24
Shooting Sports USA - January 2018 - 25
Shooting Sports USA - January 2018 - 26
Shooting Sports USA - January 2018 - 27
Shooting Sports USA - January 2018 - 28
Shooting Sports USA - January 2018 - 29
Shooting Sports USA - January 2018 - 30
Shooting Sports USA - January 2018 - 31
Shooting Sports USA - January 2018 - 32
Shooting Sports USA - January 2018 - 33
Shooting Sports USA - January 2018 - 34
Shooting Sports USA - January 2018 - 35
Shooting Sports USA - January 2018 - 36
Shooting Sports USA - January 2018 - 37
Shooting Sports USA - January 2018 - 38
Shooting Sports USA - January 2018 - 39
Shooting Sports USA - January 2018 - 40
Shooting Sports USA - January 2018 - 41
Shooting Sports USA - January 2018 - 42
Shooting Sports USA - January 2018 - 43
Shooting Sports USA - January 2018 - 44
Shooting Sports USA - January 2018 - 45
Shooting Sports USA - January 2018 - 46
Shooting Sports USA - January 2018 - 47
Shooting Sports USA - January 2018 - 48
Shooting Sports USA - January 2018 - 49
Shooting Sports USA - January 2018 - 50
Shooting Sports USA - January 2018 - 51
Shooting Sports USA - January 2018 - 52
Shooting Sports USA - January 2018 - 53
Shooting Sports USA - January 2018 - 54
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