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SESK: Stuff Everyone Should Know · sesk.info/hunt-ammunition-match-exactly

How closely must ammunition markings match the firearm?

The caliber or gauge and shell length must match exactly.

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  1. They must match exactly ✔
  2. The gauge may be close
  3. Only the brand must match

Why: Read the firearm's barrel stamp and the ammunition headstamp. Correct caliber or gauge is not enough if the required shell length differs.

Huh, didn't know that: Brand names do not determine whether ammunition fits a firearm.

The dad joke
Why did the ammunition read the label twice? It wanted an exact match.
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References

Answer: They must match exactly. Read the firearm's barrel stamp and the ammunition headstamp. Correct caliber or gauge is not enough if the required shell length differs.

  1. IHEA-USA Education Standards: The Complete Guide www.ihea-usa.org/wp-content/uploads/2021/07/IHEAUSA_HunterEduStd_Comp_Digital-1.pdf
    You must match the descriptions exactly
    Checked 2026-10-09.

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