Europe is increasing 155 mm ammunition output, but production is no longer the main bottleneck. Testing, certification and fragmented national standards are now slowing deliveries across the continent.
Since 2022, European countries have moved to sharply expand artillery ammunition output, particularly 155 mm rounds, which have become central to high-intensity warfare. Several manufacturers have announced significant increases, with production targets rising by several tens of percent across Europe.
At the same time, governments have ramped up orders to replenish stockpiles and sustain support to Ukraine, placing continuous pressure on industrial supply chains.
But even as output rises, delivery timelines remain long. The gap between production and availability points to a structural issue: Europe’s testing, certification and approval processes remain fragmented and difficult to align.
The hidden bottleneck: testing, certification and approval
Producing ammunition does not make it immediately usable in operations. Each batch must still go through technical testing, safety validation and formal certification before it can be fielded.
In practice, these procedures remain largely national. Ammunition approved in one country may still require additional testing in another, even when its technical characteristics are similar.
The result is duplication. Testing resources are used more than once, timelines stretch, and delivery pipelines slow down at the very moment governments are trying to accelerate them.
In practical terms, this means ammunition can sit in storage awaiting validation, even as operational demand remains urgent.
This bottleneck is now being addressed more directly through a European Defence Agency initiative to coordinate ammunition qualification testing, backed by an initial 50 million euros.
155 mm: interoperability remains incomplete
The 155 mm caliber is often treated as a common standard across European and allied armed forces. In practice, interoperability remains incomplete, largely because validation procedures and technical standards still vary between countries.
The issue is not the caliber itself. Differences in safety requirements, approval rules and system-specific compatibility constraints continue to limit full interchangeability.
As a result, two forces using the same caliber may not be able to exchange ammunition immediately without additional verification, a limitation that continues to surface in discussions on standardization within NATO.
Operationally, this reduces flexibility in combined operations and can delay the availability of critical supplies in time-sensitive situations.
Standardizing to deliver faster
The goal of the European Defence Agency program is to streamline testing procedures and promote mutual recognition of results across member states.
In practice, this means cutting redundant testing, aligning validation criteria and shortening the path from factory output to operational use.
This effort represents a first step toward a European ammunition qualification framework that could later be extended to other calibers.
If successful, the impact would be immediate. Production gains would translate more directly into battlefield availability, reducing the lag between manufacturing and deployment.
The real cost of European fragmentation
The issue goes beyond timelines. Fragmentation also carries a real industrial and logistical cost.
Each national procedure requires its own testing campaign, dedicated personnel and additional waiting periods. For manufacturers, this increases costs and reduces visibility on delivery schedules. For armed forces, it complicates planning and stock management.
The European Commission has highlighted that harmonizing procedures is essential to improving the overall efficiency of the European defense industrial base.
From urgency to structure
What is emerging now is a shift in approach.
The first phase of the European response, driven by the war in Ukraine, focused on increasing output as quickly as possible. The current phase reflects a different priority: structuring procedures, aligning standards and improving the efficiency of the system around production.
This shift is visible in recent European initiatives, particularly those led by the European Defence Agency.
If implemented effectively, standardization could shorten the time between production and use, improve the circulation of ammunition between allied forces and enhance operational responsiveness in a prolonged conflict.
Whether this effort succeeds will depend on several factors, including real adoption by member states, effective alignment of procedures and the ability of industry to keep pace.
Limitations remain. National doctrines differ, regulatory frameworks are not fully aligned, and industrial interests do not always converge.
The real test will come through measurable results: shorter qualification timelines, a higher number of mutualized procedures and the extension of this approach to other types of ammunition.
In that sense, standardization is no longer a secondary technical issue. It is becoming a central condition for Europe’s ability to sustain high-intensity warfare over time.
