What bullet diameter is .256 Newton?

.256 Newton uses a 0.264″ (6.71 mm) diameter bullet.

Is .256 Newton still in production?

.256 Newton is obsolete; typical availability is collector.

What is .256 Newton used for?

.256 Newton is primarily used for hunting, target.

What is .256 Newton based on?

.256 Newton is derived from the .30-06 Springfield case.

Rifle · Obsolete / Non-standard

.256 Newton

6.5mm Newton256 Newton

Early high-velocity American 6.5 mm sporting cartridge (essentially a "6.5-06")..

Identity

Introduced: 1913
Type: Rifle
Origin: United States
Inventor: Charles Newton
Manufacturer: Newton Arms
Standard: Obsolete / Non-standard
Status: Obsolete
Availability: Collector

Dimensions

Bullet ⌀: 0.264″
Primer: Large Rifle
Case type: Rimless

Ballistics

Published velocity/energy data isn't available for .256 Newton — an obsolete/collector cartridge. Parent case: .30-06 Springfield.

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

.30-06 Springfield

Family TreeOpen .256 Newton in the interactive cartridge family tree↗

Connected reference

FirearmsFirearms in .256 Newton↗

History

Introduced 1913 by Charles Newton; formed from the .30-06 case necked to 6.5 mm — NOT derived from the larger .30 Newton case.

FAQs

What bullet diameter is .256 Newton?: .256 Newton uses a 0.264″ (6.71 mm) diameter bullet.
Is .256 Newton still in production?: .256 Newton is obsolete; typical availability is collector.
What is .256 Newton used for?: .256 Newton is primarily used for hunting, target.
What is .256 Newton based on?: .256 Newton is derived from the .30-06 Springfield case.

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