6mm ARC - Getting started with reloading

Published on August 23, 2020
Duration: 105:59

This guide details the process of resizing and trimming 6mm ARC brass for reloading. It covers using a small base sizing die, achieving the correct shoulder bump for semi-automatic rifles, and trimming cases to the appropriate length. The video emphasizes careful measurement and adjustment to ensure reliable function and brass longevity.

Quick Summary

The 6mm ARC is a SAAMI-spec cartridge designed for AR-15 platforms, capable of shooting heavy bullets for long-range and hunting. Key reloading considerations include a 52,000 psi pressure limit, a recommended 0.002-inch shoulder bump for semi-automatics, and careful attention to case trimming and headspace measurements.

Frequently Asked Questions

What is the recommended shoulder bump for 6mm ARC brass when reloading for a semi-automatic rifle?

For semi-automatic rifles like those chambered in 6mm ARC, a shoulder bump of approximately 0.002 inches is recommended. This ensures reliable chambering and ejection without excessive brass stretching, which can lead to premature case failure.

What are the key differences between the 6mm ARC, 6.5 Grendel, and 6 PPC cartridges?

All three cartridges share the 220 Russian parent case. However, the 6mm ARC is designed with a slightly longer body and more taper, allowing it to efficiently shoot heavier 6mm bullets from AR-15 platforms, offering versatility for both long-range shooting and hunting.

What are the potential issues with factory 6mm ARC ammunition?

Some factory 6mm ARC ammunition, particularly the Hornady Black 105-grain BTHP, has been reported to jam into the rifling lands. This can prevent proper chambering and ejection, requiring manual removal and potentially causing a mess.

What is the maximum pressure limit for the 6mm ARC cartridge?

The 6mm ARC cartridge has a maximum average pressure limit of 52,000 psi. This is consistent with the 6.5 Grendel and is crucial for maintaining the longevity of bolts and barrel extensions in AR-15 platforms.

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