What bullet diameter is 6mm HAGAR?

6mm HAGAR uses a 0.243″ (6.17 mm) diameter bullet.

Is 6mm HAGAR still in production?

6mm HAGAR is limited; typical availability is specialty.

What is 6mm HAGAR used for?

6mm HAGAR is primarily used for competition, target, varmint.

What is 6mm HAGAR based on?

6mm HAGAR is derived from the .30 Remington case.

Rifle · Proprietary

6mm HAGAR

6 HAGAR6mm Harrison-Goodling Automatic Rifle

High-capacity 6 mm AR-15 competition cartridge based on the .30 Remington case family..

Identity

Introduced: 2003
Type: Rifle
Origin: United States
Inventor: John Harrison, Sid Goodling
Manufacturer: Hornady (brass)
Standard: Proprietary
Status: Limited
Availability: Specialty

Dimensions

Bullet ⌀: 0.243″
Primer: Small Rifle
Case type: Rimless

Ballistics

Published velocity/energy data isn't available for 6mm HAGAR. Parent case: .30 Remington.

Reloading cost

Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.

Powder $/lbCharge (gr)Bullet $/eaPrimer $/eaBrass reusesBrass $/ea

Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.

Lineage

Immediate parent

.30 Remington

Family TreeOpen 6mm HAGAR in the interactive cartridge family tree↗

Connected reference

FirearmsFirearms in 6mm HAGAR↗

History

Designed ~2003 by John Harrison and Sid Goodling ("HAGAR" = Harrison-Goodling Automatic Rifle) for NRA High Power; Hornady produced brass from 2012 (never loaded ammo).

FAQs

What bullet diameter is 6mm HAGAR?: 6mm HAGAR uses a 0.243″ (6.17 mm) diameter bullet.
Is 6mm HAGAR still in production?: 6mm HAGAR is limited; typical availability is specialty.
What is 6mm HAGAR used for?: 6mm HAGAR is primarily used for competition, target, varmint.
What is 6mm HAGAR based on?: 6mm HAGAR is derived from the .30 Remington case.

Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. Spotted an error? Report it →