Illustrative graphic by ISC Defence Intelligence, 16 June 2026. Figures drawn from the DE&S Preliminary Market Engagement Notice (2025/S 000-075181). Reticle motif is decorative.

Project SHAMER: UK's Multi-Calibre Sniper Tender Nears as .300 Norma Magnum Enters Service

What is happening

The Ministry of Defence (MOD) is moving Project SHAMER, its Multi-Calibre Sniper Weapon Capability, toward a formal competition that the defence press now expects to open in early June 2026. The programme is run by Defence Equipment and Support (DE&S), the MOD's procurement arm, and it will replace the in-service L115A3 Long Range Rifle. The requirement has grown well beyond a rifle buy. It now covers complete sniper weapon systems, ancillary equipment such as suppressors, bipods and carriage, and through-life support and maintenance. The headline technical change is a third cartridge nature: the .300 Norma Magnum, which joins the .338 Lapua Magnum and 7.62x51 mm NATO rounds the UK already holds.

The figures have moved sharply since the first notice. A February 2025 tender described a single-chassis, multi-calibre, bolt-action rifle valued at roughly £1 million to £4 million. The Preliminary Market Engagement Notice (PMEN) that DE&S published on 29 October 2025 reset the estimated value to £20 million including Value Added Tax (VAT), about £16.67 million once VAT is stripped out, and moved the estimated contract start to March 2027. The contract term runs up to seven years, with deliveries provisionally scheduled between 9 March 2027 and 7 March 2034. As of the latest market-engagement round, no formal tender had been issued. DE&S has been explicit that the engagement notice is not a call for competition and that it reserves the right to amend scope and approach.

In eight months the requirement has grown from a £1 million to £4 million rifle buy into a £20 million capability package, and the timeline has slipped by roughly nine months to a March 2027 contract start. ISC assessment of the DE&S Preliminary Market Engagement Notice, 29 October 2025

Why three calibres

A single-chassis, multi-calibre rifle lets one weapon switch cartridge by changing the barrel, bolt head and magazine, so a sniper pair can match the round to the task without holding three separate rifles. The choice of natures tells the story. The 7.62x51 mm NATO round gives commonality with the wider small-arms fleet, lower training and ammunition cost, and adequate precision at shorter ranges. The .338 Lapua Magnum (8.6 mm) is the current long-range anti-personnel round behind the L115A3, effective well past a kilometre. The new entrant, .300 Norma Magnum, sits deliberately between the two: it pushes a 7.62 mm (0.30 in) projectile at high velocity for a flatter trajectory and better retained energy than 7.62x51, while recoiling less and wearing barrels more slowly than .338.

This is not a UK invention. The .300 Norma Magnum is already established in allied service. US Special Operations Command adopted the Barrett Mk22 Advanced Sniper Rifle, a multi-calibre bolt-action chambered for 7.62 mm NATO, .300 Norma Magnum and .338 Norma Magnum, precisely to give one platform a graduated reach. SHAMER points the UK toward the same logic, and toward closer alignment with NATO precision-fires trends.

A programme that keeps moving

SHAMER has been redrawn at least twice. What began as a modest rifle replacement is now a capability package with a seven-year support tail, and the start date has drifted to the right with each revision. The sequence below is drawn from the published notices and subsequent reporting.

Personnel, training and the logistics tail

For the weapons and ammunition community, the interesting cost in a multi-calibre programme is rarely the rifle. It is everything behind it. Introducing .300 Norma Magnum as a new nature means a fresh UK qualification and safety case, lot acceptance and proof, ammunition storage and hazard classification under the Defence Safety Authority's regulatory framework for ordnance, munitions and explosives (DSA 03.OME), and transport classification for road and air movement. Each retained nature, .338 Lapua Magnum and 7.62x51, continues to draw on its own supply chain. Three natures in one capability multiplies the surveillance, proof and lot-tracking workload across the cartridge inventory.

At unit level, a single-chassis rifle adds barrel, bolt-head and magazine change drills, separate zero data per calibre, and suppressor management across pressures and signatures that differ by round. Training value is real, since one platform can carry a sniper pair from qualification through to the longest engagements, but the conversion burden and the spares range are genuine. Whether a single rifle must field all three calibres, or the fleet collectively must cover them, is one of the open questions the tender will need to settle.

Data gaps

Several parameters that matter to an informed assessment are not yet in the public record. The notices do not state the quantity of systems to be bought, the receiving units, or the optic and fire-control solution. They do not confirm whether each rifle must convert across all three calibres or whether the requirement is met at fleet level. The ammunition suppliers and the precise loadings for the new .300 Norma Magnum nature are unstated, as is the suppressor signature requirement. The relationship to other UK precision systems, including the L129A1 sharpshooter rifle and the L118 cited in the original notice, is not spelled out. Finally, the main tender date itself is a moving target: the 29 October 2025 notice gave a January 2026 estimate, which has already passed, and current reporting points to early June 2026. ISC treats the tender-launch date as reported rather than confirmed.

Corrections & updates welcome. If you hold open-source data that refines or corrects any parameter in this article, please contact [email protected] citing the specific claim and your source. Verified corrections will be incorporated and credited in the revision history. AI-assisted technical assessment based on open-source material. Not a formal intelligence product.