Short-Action Magnum Efficiency

The 7mm Remington Short Action Ultra Magnum (SAUM) was built to deliver magnum performance in a short-action rifle.

It does not rely on sheer velocity alone.
It relies on efficient case geometry and modern bullet design.

This cartridge thrives in precision-oriented platforms and modern hunting rifles.

I. Typical Twist Rate

Most factory 7mm SAUM rifles use:

1:9″ twist

Many custom rifles use:

1:8.5″ to 1:8″

This allows reliable stabilization of:

• 139–140 grain bullets
• 160–165 grain bullets
• 175 grain bullets
• Long, high-BC ULD hunting bullets

Twist stability margin is generally excellent in this cartridge.

II. Velocity Envelope

Typical velocities:

• 140 grain: ~3000–3100 fps
• 160 grain: ~2900 fps
• 175 grain: ~2800–2850 fps

This places it near traditional 7mm Remington Magnum performance, but in a short action.

The SAUM delivers:

• Strong retained velocity
• Efficient powder burn
• Predictable recoil impulse

III. Optimal Weight Classes

139–140 Grain
High-speed, flat-shooting hunting option.

160–165 Grain
Balanced choice for elk-sized game.

175 Grain
Extended-distance authority with high sectional density.

The 175 class is increasingly popular among precision-minded hunters.

IV. Bullet Geometry Considerations

The 7mm SAUM rewards:

• Moderate-to-long ogive designs
• Controlled expansion construction
• High BC without excessive length

Because many SAUM rifles are modern builds, they tolerate longer bullet designs well.

However, extreme-length match bullets are not required for ethical hunting performance.

Structure and proportionality still matter.

V. Where It Fits

The 7mm SAUM is ideal for:

• Precision hunting rifles
• Western open-country use
• Shooters who want magnum performance without long-action rifles

It is a modern efficiency magnum.