308 Win - AR-10 - Lapua Scenar 155 & 167gr with RL 15

Published on April 24, 2019
Duration: 34:53

This guide details the reloading process for .308 Winchester cartridges using Lapua Scenar bullets and Alliant Reloder 15 powder, as demonstrated by Johnny's Reloading Bench. It covers component selection, priming, powder charging, bullet seating, and crucial safety considerations during range testing, emphasizing the identification and avoidance of dangerous pressure signs. The expert-level instruction highlights the importance of meticulous measurement and component compatibility for safe and accurate reloads.

Quick Summary

Expert reloading advice for .308 Winchester AR-10 builds emphasizes using components like Lapua Scenar bullets and RL 15 powder. Key techniques include precise bullet seating using CBTO measurements and vigilant monitoring for pressure signs such as ejector marks and blown primers to ensure safe operation.

Chapters

  1. 00:00Introduction and Project Overview
  2. 02:33Load Data and Component Selection
  3. 08:04Reloading Process: Priming and Charging
  4. 10:15Bullet Seating and Measurements
  5. 12:04Range Testing: 167gr Scenar
  6. 15:20Range Testing: 155gr Scenar and Pressure Issues
  7. 18:37Final Analysis and Conclusions

Frequently Asked Questions

What are the recommended components for reloading .308 Winchester in an AR-10?

For an AR-10 .308 Winchester build, consider using new brass like Hornady, Winchester WLR primers, Alliant Reloder 15 powder, and precision bullets such as the Lapua Scenar (155gr or 167gr tested). Ensure compatibility with your rifle's gas system and magazine length.

How do you identify dangerous pressure signs when reloading .308 Winchester?

Watch for visual cues on fired brass: heavy ejector marks, swipes, flattened primers, or blown primers. If any of these are present, especially blown primers, stop testing immediately as it indicates excessive pressure that can damage the firearm or cause injury.

What is the difference between COAL and CBTO in reloading?

COAL (Cartridge Overall Length) is the total length of the loaded cartridge. CBTO (Cartridge Base to Ogive) measures from the case base to the bullet's ogive transition point. CBTO is crucial for ensuring consistent seating depth and bullet jump, especially with different bullet shapes.

Why is Alliant Reloder 15 a good powder choice for .308 Winchester AR-10 builds?

Alliant Reloder 15 is often recommended for .308 Winchester in AR-10 platforms due to its reliable performance, good metering characteristics, and its tendency to preserve brass life compared to some slower-burning powders, contributing to consistent cycling and reloading potential.

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