Bench 3

Annealing

Restore brass ductility for consistent neck tension and longer case life.

Every bench matters. Basics returns the work to the SAAMI baseline. · Control and Tune add measurement depth when the work calls for it.

At the bench

See the process in action

Bench 3

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Annealing walkthrough — neck hardness, heat application, and induction vs. torch

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Bench 3 Basics

Annealing

What you're doing and why

Firing and resizing work-harden the neck and shoulder area of the case. As that area hardens, neck tension can change, bullet release becomes less consistent, and necks become more prone to cracking.

Annealing applies controlled heat to return the neck and shoulder toward a softer, more ductile working state. Done consistently, it supports repeatable neck tension and extends brass life.

Bench 3 annealing diagram highlighting the neck and shoulder region of a rifle case.

Understand why brass hardens

Brass work-hardens when it is repeatedly expanded during firing and reduced during resizing. As the neck hardens, springback increases and consistent neck resizing becomes harder to control. That shows up as changing seating feel, changing neck tension, reduced accuracy, and eventually cracked necks.

Heat only the neck and shoulder

Annealing applies controlled heat only to the neck and shoulder region. It is a time-and-temperature dependent process: enough heat restores ductility, while too much heat in the wrong place can weaken the case. Never anneal the case head or lower body.

You'll need Induction annealing machine (recommended) or torch setup with case rotation

Let it air cool

Let annealed brass air cool. Dropping brass in water cools it faster, but it does not improve the annealing result or set hardness the way quenching does with steel. Avoid the mess and let it air cool.

Decide how often to anneal

Sigma8 recommends annealing after every firing for the tightest process control. Many shooters anneal every second or third firing with good results, and that can be valid when the process is proven. Track your schedule, watch seating feel, and let cracked necks or changing neck tension tell you when your process is drifting.

Bench 3 Control

Annealing

What you're controlling

Annealing is controlled by method, timing, and repeatability. Record whether the brass was not annealed, torch annealed, or induction annealed, then keep that process consistent across the batch.

Control Point 1

Annealing Method and Schedule

Your annealing method becomes part of the load record: None, Torch, or Induction. Induction machines apply a repeatable time-and-energy cycle. Torch annealing can also work, but only if case rotation, flame position, and time in the flame are controlled the same way every time. If you do not anneal, record None. That is still valid process data.

You'll need Induction annealing machine, or torch setup with case rotation

Logbook Record Layer

- Annealing method used (None / Torch / Induction)
- Machine or torch setup used
- Duration the neck is held in the flame, if using a torch method
- Setting on the induction annealing machine, if using induction
- When in the brass lifecycle you annealed (every firing, every 2nd, every 3rd)
- Observations about neck feel or tension during bullet seating
- Cases removed from batch — and why

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