Duplicating Mk 262 Mod 1 - ep1 - Factory Black Hills 77gr OTM tests

Published on August 28, 2017
Duration: 33:15

This video details the process of duplicating the Mk 262 Mod 1 ammunition, using factory Black Hills 77gr OTM as a benchmark. Expert Johnny provides a methodical approach, starting with baseline testing of factory rounds for accuracy and velocity. He emphasizes safety, component analysis, and the use of ballistics software like QuickLOAD to select appropriate reloading components and powders for achieving military-grade performance. The guide covers historical context, cost analysis, and detailed component inspection.

Quick Summary

Duplicating Mk 262 Mod 1 ammunition involves analyzing factory loads like Black Hills 77gr OTM. Key steps include baseline accuracy testing (0.595 MOA average), velocity measurement (2754 fps average), and component inspection. Reloading offers significant cost savings, estimated at $0.41 per round versus $1.07 for factory loads.

Chapters

  1. 00:00Project Introduction: Duplicating Mk 262 Mod 1
  2. 01:13Safety and Components: 5.56 NATO vs .223 Rem
  3. 02:50Mk 262 History and Evolution
  4. 04:49Cost Analysis: Factory vs Reloading
  5. 07:34Range Baseline Testing: Factory Accuracy
  6. 11:18Physical Measurements: OAL and Crimp
  7. 14:18Component Teardown and Comparison
  8. 15:55Powder Analysis: Factory Charge Weight
  9. 17:29Powder Selection Strategy for Cloning

Frequently Asked Questions

What is the primary goal of the Mk 262 Mod 1 duplication project?

The primary goal is to replicate the performance of the military Mk 262 Mod 1 ammunition using commercially available reloading components. This involves detailed analysis of factory ammunition like Black Hills 77gr OTM to understand its characteristics and then applying that knowledge to handload similar rounds.

What are the key components needed to clone Mk 262 Mod 1 ammunition?

Key components include a 77-grain Open Tip Match (OTM) or Hollow Point Boat Tail (HPBT) bullet, preferably with a cannelure like the Sierra MatchKing 77gr HPBT. The cartridge case is typically Lake City brass, and a spherical (ball) powder is used, similar to what Black Hills Ammunition employs.

What accuracy and velocity can be expected from factory Mk 262 Mod 1 ammunition?

Factory Black Hills 5.56mm 77gr OTM ammunition, used as a baseline, demonstrated an average group size of 0.595 MOA at 100 yards and an average muzzle velocity of 2754 fps when tested with a suppressor.

Why is it important to distinguish between 5.56 NATO and .223 Remington when reloading Mk 262 Mod 1 clones?

5.56 NATO ammunition operates at higher pressures than standard .223 Remington. Reloading Mk 262 Mod 1 clones requires using components and load data suitable for 5.56 NATO chambers to avoid dangerous over-pressure situations and ensure safe firearm operation.

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