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The Howa M1500 .300 Winchester Magnum Long Action Barrelled Action with 26″ blued semi-heavy barrel delivers maximum muzzle velocity from the .300 Win Mag in a field-balanced profile lighter than a full heavy barrel. Features cold-hammer-forged blued steel with 1:10″ twist rate and threaded muzzle with thread cap, HACT two-stage trigger, three-position safety, forged bolt…

Howa M1500 Long Action Barrelled Action – .300 Winchester Magnum | 26″ Blued Semi-Heavy Barrel | Threaded with Cap

The Howa M1500 .300 Winchester Magnum Long Action Barrelled Action with 26″ blued semi-heavy barrel is a Japanese-manufactured precision platform built on the M1500 long action receiver, offering a longer and lighter barrel profile than the heavy barrel variant for shooters who prioritise maximum muzzle velocity, extended reach, and a more field-balanced overall weight in the .300 Win Mag. Featuring a cold-hammer-forged blued steel semi-heavy barrel threaded with thread cap, HACT two-stage trigger, and three-position safety, the Howa M1500 .300 Win Mag SHB 26″ barrelled action is the ideal foundation for a long-range hunting rifle or precision magnum build where barrel length and velocity take priority over the stiffness of a full heavy profile.

Note: This is a barrelled action only. No stock is included. The .300 Win Mag is chambered on the M1500 long action receiver. Compatible with Howa M1500 long action stocks, chassis systems, and aftermarket solutions from MDT, KRG, and others. Purchase of firearms in South Africa requires a valid firearms licence and compliance with the Firearms Control Act.

Why the Howa M1500 .300 Win Mag SHB 26″ Offers Maximum Velocity with Field-Ready Balance

Semi-Heavy Barrel Profile — Between Sporter and Full Heavy
The semi-heavy barrel (SHB) profile of this Howa M1500 .300 Win Mag barrelled action sits between a sporter weight barrel and the full #6 varmint heavy barrel, providing improved stiffness and heat management over a standard hunting sporter while remaining lighter and more field-balanced than a full heavy barrel at the same length. For hunters who carry their rifle over long distances and need a longer barrel for velocity without the weight penalty of a full heavy profile, the semi-heavy is the practical choice.

.300 Winchester Magnum — The World Standard Big-Bore Long-Range Cartridge
The .300 Winchester Magnum has been one of the world’s most widely used long-range hunting and precision cartridges since its introduction in 1963. The .300 Win Mag drives 180 to 220 grain projectiles at velocities between 2,850 and 3,000 fps from a 24″ barrel, with the 26″ barrel adding a further 30 to 50 fps of muzzle velocity — producing a meaningfully flatter trajectory and increased retained energy at long range. Ammunition, components, and reloading data for the .300 Win Mag are available worldwide in greater variety than any other belted magnum cartridge.

26″ Barrel for Maximum Muzzle Velocity
The 26″ barrel length extracts the maximum available muzzle velocity from the .300 Win Mag’s large propellant capacity, adding approximately 30 to 50 fps over the 24″ heavy barrel variant. For long-range hunting and precision shooting where every fps of additional velocity contributes to reduced drop and wind drift at extended distances, the 26″ barrel delivers the full ballistic potential of the .300 Win Mag cartridge.

Cold-Hammer-Forged Blued Steel — 1:10″ Twist Rate
The Howa M1500 .300 Win Mag 26″ semi-heavy barrel is cold-hammer-forged steel, finished in matte blue, with a 1:10″ twist rate that stabilises the full range of .300 Win Mag projectiles from 150 to 220 grains. Cold-hammer forging produces a barrel with superior dimensional consistency, a harder bore surface, and longer service life compared to button-rifled alternatives.

Threaded Muzzle with Thread Cap — Suppressor and Muzzle Brake Ready
The Howa M1500 .300 Win Mag 26″ SHB barrel is threaded at the muzzle with a thread cap included, allowing direct fitment of suppressors, muzzle brakes, and compensators without gunsmithing. A muzzle brake is highly effective on the .300 Win Mag, significantly reducing felt recoil and muzzle rise for faster target reacquisition.

HACT Two-Stage Trigger — Precision-Focused Factory Trigger
The Howa M1500 barrelled action includes the HACT (Howa Actuator Controlled Trigger) two-stage trigger system. Self-contained and attached to the receiver via a single Allen screw, the HACT delivers a clean, predictable two-stage pull with a defined take-up and crisp break, adjustable for pull weight to suit hunting or long-range precision use.

Three-Position Safety for Safe Field Handling
The Howa M1500 three-position safety provides forward for fire, middle for bolt operation with trigger locked, and rear for full bolt and trigger lock during carry.

Sub-MOA Accuracy Guarantee
Howa guarantees the M1500 barrelled action to produce sub-MOA groups with appropriate factory ammunition, reflecting the tight dimensional tolerances and precise chambering and headspacing applied at the Japanese factory.

Howa M1500 .300 Win Mag 26″ Blued Semi-Heavy Barrel Long Action Barrelled Action Full Specifications

• Model: Howa M1500 Long Action Barrelled Action
• Calibre: .300 Winchester Magnum
• Action: Bolt action, long action
• Barrel Length: 26 inches
• Barrel Profile: Semi-heavy barrel (SHB)
• Barrel Construction: Cold-hammer-forged steel
• Barrel Finish: Matte blue
• Twist Rate: 1:10 inches
• Muzzle Thread: Threaded with thread cap included
• Trigger: HACT two-stage, adjustable
• Safety: Three-position
• Bolt: Forged, two locking lugs, 90-degree throw, M16-style extractor
• Magazine: Internal, 3+1 capacity (stock/chassis dependent)
• Stock: Not included (barrelled action only)
• Accuracy Guarantee: Sub-MOA
• Origin: Japan
• Ideal For: Long-range hunting, precision chassis builds, extended-range field shooting, suppressed use
• Brand: Howa