Mk262 Cloning - pt 6 - BL-C(2) and TAC

Published on October 4, 2017
Duration: 28:31

This video details the process of cloning Mk262 Mod 1 ammunition using BL-C(2) and Ramshot TAC powders with 77gr Sierra MatchKing bullets. While both powders achieved the target velocity of ~2750 fps at an OAL of 2.246 inches, neither provided optimal accuracy at higher pressure levels, with BL-C(2) showing significant degradation and TAC performing slightly better. CCI No. 41 primers yielded higher velocities than Remington 7 1/2 primers when used with TAC.

Quick Summary

For Mk262 cloning with 77gr SMK bullets, BL-C(2) and Ramshot TAC powders were tested. Both achieved target velocities around 2750 fps at a 2.246" OAL, but accuracy degraded at higher pressures. CCI No. 41 primers showed a velocity advantage over Remington 7 1/2 with TAC.

Chapters

  1. 00:00Intro: Mk262 Cloning Goal
  2. 01:14Powder Test: BL-C(2) & Ramshot TAC
  3. 02:02Bullet & Primer Variables
  4. 04:44Load Data & Pressure Warnings
  5. 09:04Reloading Process & Equipment Issue
  6. 11:24Range Test: BL-C(2) Results
  7. 16:53Range Test: Ramshot TAC Results
  8. 20:05Data Analysis & Primer Impact
  9. 26:08Conclusion & Future Plans

Frequently Asked Questions

What powders were tested for the Mk262 cloning project?

In this installment of the Mk262 cloning series, Johnny's Reloading Bench tested Hodgdon BL-C(2) and Ramshot TAC rifle powders. Both are ball powders, chosen for their consistency and similarity to powders found in factory Mk262 ammunition.

What were the accuracy results for BL-C(2) and Ramshot TAC when cloning Mk262?

While both powders reached the target velocity of around 2750 fps, accuracy suffered at higher pressures. BL-C(2) produced groups up to 2-3 inches, while TAC performed slightly better but still saw groups open up at maximum loads.

Did primer choice affect velocity in the Mk262 clone testing?

Yes, the testing indicated a difference. When using Ramshot TAC powder, CCI No. 41 primers resulted in a significant velocity increase, up to 37 fps higher, compared to Remington 7 1/2 small rifle primers.

What is the recommended OAL for this Mk262 clone load, and what are the pressure implications?

The tested OAL for the Mk262 clone load was 2.246 inches. This shorter length increases pressure compared to standard SAAMI OALs (like 2.260 inches), requiring careful attention to load data and pressure signs during development.

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