Mk 262 Cloning - pt 4 - Fine tuning AA2520 and CFE 223 loads

Published on September 8, 2017
Duration: 32:46

This video provides an expert-level guide to handloading Mk 262 Mod 1 clone ammunition, focusing on fine-tuning loads with Accurate 2520 and Hodgdon CFE 223 powders. The instructor, demonstrating high expertise in precision reloading, meticulously tests components, analyzes chronograph data, and measures group sizes to achieve specific velocity nodes and accuracy, offering valuable insights for advanced reloaders.

Quick Summary

Expert reloaders can create Mk 262 clone loads using 77gr bullets (Sierra SMK, Nosler CC), LC brass, CCI No. 41 primers, and powders like Accurate 2520. Target velocities are 2750-2760 fps, with loads like 25.2gr AA2520 yielding 2768 fps and sub-MOA groups.

Chapters

  1. 00:00Introduction & Project Goals
  2. 01:19Factory Ammo Runout Testing
  3. 05:33Load Data Review & Planning
  4. 07:59Component Selection & Preparation
  5. 09:23Range Testing: Accurate 2520
  6. 12:39Range Testing: CFE 223 & Runout Results
  7. 15:08Final Analysis & Future Steps

Frequently Asked Questions

What are the key components for a Mk 262 clone load?

Key components include 77gr bullets like the Sierra 77gr MatchKing (SMK) or Nosler 77gr Custom Competition, Lake City (LC) brass, CCI No. 41 primers, and a target Overall Length (OAL) of 2.246 inches. Powders like Accurate 2520 or Hodgdon CFE 223 are used for fine-tuning.

What is the target velocity for Mk 262 clone ammunition?

The target velocity node for replicating Mk 262 Mod 1 performance is generally between 2750 and 2760 feet per second (fps). This velocity range aims to match the ballistics of factory Black Hills 77gr OTM ammunition.

How does Accurate 2520 perform in Mk 262 clone loads?

Accurate 2520, particularly at 25.2 grains with a 77gr bullet, demonstrated excellent performance, achieving velocities around 2768 fps and producing tight groups as small as 0.371 inches.

Does bullet runout significantly affect accuracy in 5.56mm loads?

In testing Mk 262 clone loads, significant bullet runout (up to 0.003 inches) on factory ammunition showed minimal impact on group size within the tested sample, suggesting other factors may be more critical.

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