How Accurate Is My 9mm Shotgun?

Published on December 19, 2025
Duration: 1:50

This review tests the accuracy of a 9mm round fired from a 12-gauge shotgun using a rifled adapter. The adapter, despite having rifling, proved inaccurate due to its short length and loose fit. Accuracy tests showed scattered hits and potential keyholing, significantly worse than a standard 9mm handgun.

Quick Summary

A 9mm round can be fired from a 12-gauge shotgun using a specialized adapter. However, tests show this setup is generally inaccurate, with scattered hits and potential keyholing, performing significantly worse than a standard 9mm handgun.

Chapters

  1. 00:00Intro: 9mm in a Shotgun
  2. 00:1312-Gauge to 9mm Adapter
  3. 00:28Technical Observations
  4. 00:47Accuracy Testing
  5. 01:19Firearm Identification
  6. 01:28Results & Handgun Comparison

Frequently Asked Questions

Can you shoot 9mm from a 12-gauge shotgun?

Yes, but only with a specialized adapter that fits into the 12-gauge chamber and barrel. A 9mm round is too small to fire directly from a standard 12-gauge barrel.

How accurate is a 9mm shotgun adapter?

Accuracy is generally poor. This test showed scattered hits and potential keyholing, significantly less accurate than a standard 9mm handgun, likely due to adapter design and fit.

What shotgun was used for the 9mm adapter test?

The shotgun used in the test was a GForce Arms Filthy Pheasant, an over/under model.

What causes keyholing in firearms?

Keyholing occurs when a bullet travels sideways, creating an elongated hole. It often indicates instability during flight, potentially caused by improper barrel rifling, bullet fit, or projectile damage.

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