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

Published on December 21, 2017
Duration: 41:13

This video details the process of cloning the Mk 262 Mod 1 ammunition using handloads, aiming to replicate Black Hills 77gr OTM performance. Several powders were tested for accuracy and velocity at 200 yards, with Accurate 2520 and IMR 8208 XBR showing the best results. The testing highlights powder sensitivity and pressure signs, offering valuable insights for advanced reloaders.

Quick Summary

Accurate 2520 (25.2gr) is the top performer for cloning Mk 262 loads, achieving 0.695 MOA accuracy with Sierra 77gr SMK bullets at 2,746 fps. IMR 8208 XBR also showed excellent results. Testing uses 10-shot groups at 200 yards for rigorous evaluation.

Chapters

  1. 00:00Intro: Mk 262 Clone Series Overview
  2. 01:04Components: Bullets, Brass, Primers
  3. 02:41Test Setup: 200 Yards, 10-Shot Groups
  4. 06:32Powder List for Verification
  5. 10:25Baseline: Black Hills Factory Test
  6. 13:36Accurate 2520 Load Results
  7. 17:53CFE 223 & BL-C(2) Load Results
  8. 22:45Ramshot TAC & IMR 8208 XBR Results
  9. 28:34AR-Comp & LeverEvolution Results
  10. 33:36Power Pro 2000-MR & Final Comparison

Frequently Asked Questions

What are the best performing powders for cloning Mk 262 ammunition?

For cloning Mk 262 loads with 77gr OTM bullets, Accurate 2520 (25.2gr) yielded the best accuracy at 0.695 MOA. IMR 8208 XBR (24.0gr) was also excellent at 0.779 MOA. Power Pro 2000-MR is considered a safe bet for high velocity.

What components are used in the Mk 262 clone handloads?

The Mk 262 clone loads use Sierra 77gr MatchKing bullets with cannelure, Lake City 5.56 brass, and either Remington 7 1/2 or CCI No. 41 primers. All loads are seated to an OAL of 2.246 inches.

How does the tested handload accuracy compare to Black Hills Mk 262 factory ammo?

The Black Hills factory ammo produced a 1.047 MOA 10-shot group. The best handloads, like Accurate 2520, achieved significantly better accuracy at 0.695 MOA, demonstrating the potential of precision handloading.

What are the key considerations when handloading Mk 262 clone rounds?

Key considerations include powder selection for accuracy and velocity, primer choice, consistent OAL, and monitoring pressure signs like ejector marks. Temperature sensitivity of ball powders should also be noted.

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