Daily Bulletin » AR 30 Caliber https://bulletin.accurateshooter.com from AccurateShooter.com Mon, 06 Apr 2026 05:33:04 +0000 en-US hourly 1 https://wordpress.org/?v=4.1.26 New 30 ARX — 6.5 Grendel Necked to .30 Caliber Beats 300 BLK https://bulletin.accurateshooter.com/2013/12/new-30-arx-6-5-grendel-necked-to-30-caliber-beats-300-blk/ https://bulletin.accurateshooter.com/2013/12/new-30-arx-6-5-grendel-necked-to-30-caliber-beats-300-blk/#comments Mon, 30 Dec 2013 19:20:04 +0000 http://bulletin.accurateshooter.com/?p=54163 Robert Whitley 30 ARX ar15 6.5 grendelRobert Whitley of AR-X Enterprises has a new .30-caliber cartridge for AR-platform rifles. The new 30 ARX is based on the 6.5 Grendel parent case necked-up to .30 caliber. The 30 ARX mag-feeds flawlessly in an AR15, while offering excellent accuracy, good velocity, and serious knock-down power. Compared to a 300 AAC Blackout (300 BLK), the new 30 ARX holds much more powder so it can push bullets faster and harder. Whitley’s 30 ARX boasts 57% more case capacity than a 300 Blackout. As a result, the 30 ARX outperforms the 300 BLK by a large margin. In a 20″-barreled AR, the 30 ARX can drive a 125gr bullet at 2500+ fps, or launch a heavier 150gr bullet at 2400+ fps:

30 ARX Loads
H4198, CCI BR4 Primers,
Necked-up Lapua 6.5 Grendel Brass:
2419 FPS: 28.0 gr. H4198, Nosler 125gr Ballistic Tip Hunting Bullet (2.260″ OAL)
2517 FPS: 29.0 gr. H4198, Nosler 125gr Ballistic Tip Hunting Bullet (2.260″ OAL)
2363 FPS: 28.0 gr. H4198, Sierra 150gr BT Hunting Bullet (2.240″ OAL)
2441 FPS: 29.0 gr. H4198, Sierra 150gr BT Hunting Bullet (2.240″ OAL)

Robert Whitley 30 ARX ar15 6.5 grendel

Robert Whitley explains the advantanges of the 30 ARX for AR-platform rifles: “The 30 ARX is a cartridge designed from the get-go for use in an AR-15. The case length and chamber design of the 30 ARX are optimal. The case allows the use of many of the favorite .30-cal bullets, magazine fed out of an AR-15 and backed by some real power. Brass is easy to make with a simple necking-up process. Neck it up, load it and go shoot. Good 6.5 Grendel brass is readily available, and we have 30 ARX dies available.”

Watch One-Step Process for Forming 30 ARX Case from 6.5 Grendel Brass

With the ability of Lapua 6.5 Grendel brass to handle stout loads, the 30 ARX cartridge delivers 30-30 Winchester-class performance, from the modern, semi-auto AR-15 platform. The 30 ARX cartridge has sufficient case capacity to push popular .30-cal bullets fast and accurately even at moderate chamber pressures. The case has approximately 38 grains water capacity. With its 57% greater capacity than a 300 Blackout, the 30 ARX is a more versatile, more powerful hunting cartridge (at least when loaded to supersonic speeds). With 150gr bullets running in the 2500 fps range, the 30 ARX offers impressive knockdown power in a cartridge that fits an AR-15 magazine.

  • 30 ARX Cartridge OAL mag-feeds perfectly with a variety of .30-cal bullets.
  • Longer, heavier long-range bullets (with longer COAL) can be single-loaded.
  • Lapua 6.5 Grendel brass is excellent, strong brass, that is readily available.
  • AR-X Enterprises now offers die sets for the 30 ARX.
  • The neck up process is very easy. Simply lube the inside of the necks of 6.5 Grendel brass, run the brass through your re-size die (with .30 Cal expander in place).
  • Works well with a lot of commonly available powders such as: Hodgdon 4198, Vihtavouri N130, Accurate LT-32, Accurate AA1680.
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