Starline Brass .300 Blackout Brass 100 Pack

The .300 AAC Blackout was developed by Advanced Armament Corporation to deliver .30 calibre performance from the AR-15 platform while retaining the standard bolt and magazines. Formed from a shortened and necked-up 5.56×45mm NATO case, it requires only a barrel change to convert a compatible AR-15, making it one of the most practical calibre conversions available.

Designed to excel with both supersonic and subsonic ammunition, the .300 Blackout has become the benchmark cartridge for suppressed shooting. It offers outstanding versatility for hunting, target shooting, and tactical applications, while its excellent performance from short-barrelled rifles and pistols has further cemented its popularity. In addition to the AR platform, many modern bolt-action and single-shot rifles are now chambered for this highly adaptable cartridge.

At Hamilton’s Armoury, we back Starline Brass because it’s built with the same mindset we apply to everything we do — no shortcuts. With over 30 years of dedication to quality, Starline continues to produce premium brass for those who take their shooting seriously.

Warning: Firearms fitted with floating firing pins, including the AR-15 platform and its variants, should always be loaded from the magazine rather than by dropping the bolt on a chambered round. This reduces the risk of a slam fire by allowing the bolt to lose inertia as it strips a cartridge from the magazine. Starline also recommends using primers specifically designed for AR-style rifles, as more sensitive primers may increase the likelihood of a slam fire.

Also Known As: .300 Blackout Brass, .300 AAC Blackout Brass, .300 BLK Brass, 7.62×35mm Brass

Case Length: 1.356 – 1.360" O.A.L.

Primer Size: Small Rifle

SKU: SB-4220
Availability: In Stock At Supplier

Estimated Time Of Delivery From Supplier: 7 Days To Customer

$103.00
$103.00

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At Hamilton’s Armoury, we handle shipping with a focus on speed, security, and reliability. We process orders within 1–2 business days (with weekend and public holiday orders handled on the next business day), provide tracking once dispatched and ship Australia-wide via trusted carriers. All deliveries include tracking and require a signature on arrival to help ensure parcels are received safely.

We offer Standard delivery (2–8 business days) and Express delivery (1–3 business days, where available), noting that remote or regional areas may take longer depending on carrier performance. Shipping costs are calculated at checkout based on location and method, with no added margin. We also offer in-store pickup from our Store and certain restricted items—such as powders, primers, and ammunition—are pickup-only due to transport restrictions. If an order is delayed, damaged, or incorrect, we ask customers to email sales@hamiltonsarmoury.com.au with their order number and issue details so we can resolve it promptly.

At Hamilton’s Armoury, we stand behind our products and aim to ensure every customer is satisfied. We accept returns on most new, unused items within 14 days of delivery, provided the item is in its original condition with all packaging, tags, components included and proof of purchase is supplied. We cannot accept returns for used or damaged items, special order or clearance items, gift cards, perishable goods, or customised/personalised products.

We offer exchanges for size, colour, or model where stock is available; if not, we can provide a store credit or refund. Once a return is received and inspected, we confirm approval and issue refunds to the original payment method within 5–10 business days, with shipping costs only refundable if the return is due to our error (such as an incorrect or defective item). Customers cover return shipping unless the item arrived incorrect, damaged, or faulty and we recommend using a trackable, insured service. Returns are sent to our Goornong, VIC address and to begin a return we ask customers to email sales@hamiltonsarmoury.com.au with their order number, reason, and photos where relevant; we respond within 1–2 business days, while noting we may refuse returns that don’t meet conditions and that this policy does not affect rights under Australian Consumer Law.

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