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

Published on April 24, 2019
Duration: 34:53

This video details a comprehensive reloading and testing process for a .308 Winchester AR-10 build using Lapua Scenar bullets and Alliant Reloder 15 powder. Expert insights are provided on component selection, safe load development, precise bullet seating, and interpreting pressure signs. The testing reveals the 167gr Scenar as a superior performer for the specific rifle, while the 155gr variant exhibited dangerous pressure issues, highlighting the critical nature of careful load workup.

Quick Summary

The 167gr Lapua Scenar bullet achieved excellent accuracy in a .308 Win AR-10, producing a 0.663-inch group at 2653 FPS with 45.0 grains of RL 15. Conversely, the 155gr Scenar exhibited dangerous pressure signs, including blown primers, and poor accuracy, leading to the cessation of its testing.

Chapters

  1. 00:00Introduction: .308 Win AR-10 Build & Lapua Scenar Testing
  2. 02:33Load Data & Component Selection: RL 15, Brass, Primers
  3. 08:04Reloading Process: Priming & Powder Charging
  4. 10:15Bullet Seating: COAL & CBTO Measurements
  5. 12:04Range Testing: 167gr Scenar Accuracy & Velocity
  6. 15:20Range Testing: 155gr Scenar Pressure Issues & Safety Concerns
  7. 18:37Final Analysis & Conclusions: 167gr vs 155gr Scenar

Frequently Asked Questions

What are the key components used for reloading .308 Win AR-10 loads in this video?

The video focuses on .308 Winchester loads using Lapua Scenar bullets (155gr and 167gr), Alliant Reloder 15 powder, new Hornady brass, and Winchester WLR primers. The rifle features an Aero Precision upper and a Krieger barrel.

What were the accuracy results for the Lapua Scenar bullets?

The 167gr Lapua Scenar achieved excellent accuracy, with the best group measuring 0.663 inches at 2653 FPS. The 155gr Scenar loads, however, showed poor accuracy (groups over 1.5 inches) and significant pressure issues.

What safety concerns arose during the testing?

Testing the 155gr Lapua Scenar loads led to a blown primer and heavy ejector smears at 46.1 grains of RL 15, indicating dangerous over-pressure. Testing of this bullet weight was stopped due to safety concerns.

Which Lapua Scenar bullet weight performed better in the .308 Win AR-10?

The 167gr Lapua Scenar proved to be the superior match for the tested Krieger barrel and RL 15 powder combination, delivering tight groups and acceptable velocities. The 155gr Scenar was deemed problematic due to excessive pressure signs.

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