270 Win vs 308 Win: ONE Clear Winner On Mild Steel

Published on September 14, 2023
Duration: 7:56

This video compares the .270 Winchester and .308 Winchester cartridges by testing their penetration on mild steel targets. While the .270 Win has a higher velocity and sectional density, the .308 Win ultimately penetrates a 1/2 inch steel plate due to its greater kinetic energy. The test highlights that kinetic energy is a crucial factor for steel penetration, not just velocity or bullet weight alone.

Quick Summary

The .308 Winchester successfully penetrated 1/2 inch mild steel, while the .270 Winchester failed, causing a significant bulge. The key factor was kinetic energy; the .308 Win had about 200 ft-lbs more muzzle energy, proving crucial for penetrating thicker steel targets.

Chapters

  1. 00:00Intro: .270 Win vs .308 Win Steel Test
  2. 00:18Ammunition & Velocity Testing Setup
  3. 01:00Steel Sledge 4.0 Testing Rig Upgrade
  4. 01:411/4" & 3/8" Steel Plate Penetration
  5. 03:371/2" Steel Plate Test: .270 vs .308
  6. 06:19Data Analysis: Why .308 Won
  7. 07:11Conclusion: Kinetic Energy Decides

Frequently Asked Questions

Which cartridge, .270 Win or .308 Win, penetrated 1/2 inch mild steel better?

The .308 Winchester successfully penetrated the 1/2 inch mild steel plate, while the .270 Winchester failed to penetrate, causing a significant bulge on the back of the plate.

What was the deciding factor in the .270 Win vs .308 Win steel penetration test?

The deciding factor was kinetic energy. The .308 Winchester load had approximately 200 ft-lbs more kinetic energy at the muzzle than the .270 Winchester load, enabling it to penetrate the thicker steel.

Did the .270 Winchester's higher velocity help it penetrate steel better than the .308 Winchester?

No, despite the .270 Winchester's higher velocity, its lower kinetic energy meant it could not penetrate the 1/2 inch steel plate, whereas the .308 Winchester did.

What type of ammunition was used for the .270 Win and .308 Win steel tests?

Both cartridges were tested using Hornady Interlock bullets: a 130 grain bullet for the .270 Winchester and a 150 grain bullet for the .308 Winchester.

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