Stainless Steel Strip for Ammunition Casings
Sourcing metal strip for ammunition casings at production-ready tolerances is harder than it should be. Most mills don’t serve smaller recreational runs, and those that do rarely hit the consistency that casing production requires. Eagle Metals manufactures custom brass and stainless steel coil to your exact specifications, with orders starting at 100 lbs.
Precision Coil and Strip for Recreational Ammunition Manufacturers
Ammunition casings start as flat metal strips and are formed into shape through a cup-and-draw process that demands consistent temper, tight gauge tolerances, and a clean surface finish across every coil.
Eagle Metals is a precision reroll mill supplier providing metal strip for ammunition casing production. We produce stainless steel coil and strip and cartridge brass to the exact temper and dimensional requirements casing producers specify.
Rolling, annealing, and slitting all happen in-house, so every order ships to spec without relying on outside vendors.
Ammunition Casing Strip: Cartridge Brass and Stainless Steel Alloys
Eagle Metals supplies casing strip in cartridge brass and stainless steel, with each alloy carrying distinct mechanical advantages based on your pressure specs, weight targets, and cost requirements. Grade selection depends on how the material must perform through forming and in the finished casing. We’ve outlined the most commonly specified options in recreational casing production below.
C260 Cartridge Brass Strip: The Proven Industry Standard for Casing Production
C260 cartridge brass has been the benchmark alloy for ammunition casings for generations, and for good reason. Its 70/30 copper-zinc composition delivers the ductility casing production demands alongside the tensile strength to maintain structural integrity through forming and firing.
Eagle Metals produces C260 cartridge brass strip to tight gauge and temper tolerances, giving your production line consistent, repeatable results on every coil.
304 & 304L Stainless Steel Strip for Ammunition Casings
Recreational manufacturers evaluating a brass alternative increasingly turn to 304 and 304L stainless steel strip for its lower material cost and reduced heat retention during firing.
The inherent strength of austenitic stainless steel allows for thinner casing walls, which cuts weight and creates more internal capacity for powder. Both grades maintain the formability and corrosion resistance casing production requires across a full range of tempers
316 & 316L Stainless Steel Strip for High-Performance Casings
Grade 316 and 316L stainless steel strip carries molybdenum in its alloy chemistry, which delivers a measurable step up in corrosion resistance over 304. That protection matters for casings stored in humid environments or exposed to field conditions that accelerate surface degradation.
Eagle Metals produces 316 and 316L strip to tight dimensional tolerances, with temper selection tailored to your specific forming requirements.
Tight-Tolerance Coil & Strip Built for Cup-and-Draw Casing Production
Casing production on a cup-and-draw line has zero tolerance for material variation. Eagle Metals controls every step in-house so gauge, temper, and surface finish stay consistent across the full coil.
- Precision rolling to exact gauge, held consistently across the full coil width and length
- In-house annealing across multiple furnace types for controlled temper, critical for deep-draw formability in both stainless and brass
- Custom slitting to exact strip widths using shimless tooling for tighter dimensional tolerances
- Cleaning lines that remove surface contamination prior to annealing, producing a blemish-free finish
- Edge-conditioning for burr-free slit edges or profiled finishes that meet stamping line requirements
- Fresh work rolls on every last pass for consistent surface quality and shape control across every order
Ready to Source Ammunition Casing Strip? Request a Quote Today
Recreational manufacturers are actively spec'ing stainless steel strip for ammunition casings as a brass alternative, and the ones moving now are getting ahead of supply and lead time pressure. Submit your material specifications to Eagle Metals for a custom quote below.
FAQs About Stainless Steel Strip for Ammunition Casings
Not really…304 and 316 stainless steel are austenitic grades and are non-magnetic in their normal condition. Unlike steel-core or ferritic steel casings, austenitic stainless casings will not reliably stick to a magnet. Although work-hardening during stamping can cause both alloys to become slightly magnetic, the effect is minimal and usually localized into certain areas. Range operators who use magnetic separators to sort brass from steel should be aware that stainless casings produced from these grades may sort with brass.
Temper selection depends on the alloy and severity of the draw. For example, DDQ, annealed or light tempers are common starting points where maximum formability is required. Eagle Metals produces ammunition casing strip across a full range of tempers and can match the mechanical properties your production process specifies.
Yes, stainless steel casings can be reloaded, though they require more care during resizing due to the higher strength of the material compared to brass. Many recreational manufacturers consider this a worthwhile tradeoff given the weight savings, corrosion resistance, and recyclability stainless provides.
Gauge varies by caliber and casing design, but most cup-and-draw production uses strip where tight dimensional tolerances directly affect draw ratios and finished wall thickness. Eagle Metals rolls casing strip to the exact gauge your application requires across both brass and stainless alloys.
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