Cloning Mk 262 - Verifying Our Best Loads (so far)

Published on December 21, 2017
Duration: 41:13

This video provides an expert-level analysis of cloning the Mk 262 Mod 1 load, focusing on verifying the performance of various powder and component combinations. Instructor Johnny demonstrates a methodical approach to load development, emphasizing accuracy and velocity testing at 200 yards with 10-shot groups. The content highlights the importance of component selection, powder burn rates, and temperature sensitivity in achieving optimal ballistic results for 5.56x45mm NATO ammunition.

Quick Summary

Expert reloader Johnny verifies Mk 262 clone loads using Sierra 77gr MatchKing bullets and various powders. Accurate 2520 achieved 0.695 MOA at 200 yards, while IMR 8208 XBR yielded 0.779 MOA. Testing emphasizes 10-shot groups for accuracy assessment.

Chapters

  1. 00:00Introduction: Mk 262 Cloning Series Overview
  2. 01:04Components: Sierra 77gr Bullets, Brass, Primers
  3. 02:41Test Setup: 200 Yards, 10-Shot Groups, Factory Baseline
  4. 06:32Verified Powders List & Exclusions
  5. 10:25Black Hills Factory Load Performance
  6. 13:36Accurate 2520 Results & Temperature Sensitivity
  7. 17:53CFE 223 and BL-C(2) Performance Analysis
  8. 22:45Ramshot TAC & IMR 8208 XBR: Accuracy vs. Pressure Signs
  9. 28:34AR-Comp & LeverEvolution Load Results
  10. 33:36Power Pro 2000-MR & Final Load Recommendations

Frequently Asked Questions

What are the best performing powders for cloning the Mk 262 Mod 1 load?

Based on testing, Accurate 2520 (25.2gr) provided the best accuracy with a 0.695 MOA group. IMR 8208 XBR (24.0gr) also performed well with 0.779 MOA. Alliant Power Pro 2000-MR is noted as a safe option for high velocity.

What components are recommended for replicating Mk 262 ammunition?

Key components include Sierra 77gr MatchKing HPBT bullets with cannelure, Lake City 5.56 brass, and either CCI No. 41 or Remington No. 7 1/2 primers. Loads should be seated to an OAL of 2.246 inches.

What accuracy can be expected when cloning Mk 262 loads?

Verified clone loads can achieve sub-MOA accuracy at 200 yards. The best results included a 0.695 MOA group with Accurate 2520 and a 0.779 MOA group with IMR 8208 XBR, using 10-shot groups.

How does powder choice affect velocity and pressure in Mk 262 clone loads?

Different powders yield varying velocities and pressure levels. Accurate 2520 and IMR 8208 XBR offer good accuracy, while some powders like BL-C(2) showed poor results. Ramshot TAC exhibited ejector marks, indicating higher pressure.

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