Starline Brass 300 Blackout Unprimed Bag of 100

Starline Brass 300 Blackout Unprimed Bag of 100
Item #:SU300BLK
$0.38 per piece
Shipping: One flat fee of $12.95 per online order.
Exclusions apply. Click for details.
Availability:In Stock
Volume Discounts:
Rounds Units Savings Price per Unit Total Price
100 1 <none> $37.99 $37.99
500 5 Save 5% $36.09 $180.45
1000 10 Save 10% $34.19 $341.91
2000 20 Save 13% $33.05 $661.03
Due to the packaging and shipping process, case necks are often slightly dinged or bent and need to be rounded up and sized to give proper neck tension. New and/or fired cases must be full-length resized or have the expander ball of the sizing die run through the case neck prior to loading.
Read 16 Reviews

Product Information

.300 Blackout (Small Rifle primer)

.300 AAC Blackout, .300 BLK, 7.62x35mm

1.356 - 1.360 O.A.L.

The .300 Blackout is based off of a shortened 5.56x45mm case that is necked to .30 caliber. For AR-15 platform rifles and pistols it only requires changing the barrel to go from 5.56 to .300 Blackout. The Blackout's main purpose is to be used at subsonic velocities in suppressed firearms. Many bolt action and single shot rifles are now being produced in this caliber as well.

This Starline Brass is bagged at Graf & Sons. This is not loaded ammunition.

Read 16 Reviews - Average Rating: 4.9 stars

300 BO

By Michael D. on Oct 19, 2023
I've made lots of cases for 300 Blackout from military cases, way to much work when you can buy quality cases like Starline. Good solid USA company turning out quality brass.

Highest Quality Brass

By Charles F. on Jun 01, 2023
I’ve been reloading for over 30 years and every time I can purchase Starline Brass I order it. Graf and sons system to alert me has been a pinnacle to my continuing need for Brass. Absolutely the best in the industry for customer service and far more

starline brass

By Jim R. on Apr 03, 2023
have use starline in the past in various cartridges. always quality brass.

Great value

By James A. on Dec 19, 2022
I can’t give 5 stars until I see how the brass holds up to multiple reloadings. First time buying starline rifle brass but everything looks good and their pistol brass is as good as any. Seems like starline always includes a couple extra pieces of brass per 100, great for setting up annealer. Grafs flat rate shipping can’t be beat when ordering quantity.

Very Good

By Jimmy E. on Dec 14, 2022
This is the best brass on the market, my opinion. Only brass I buy when available. Graf is great to deal with. Thanks.

Starline Brass

By Stephen F. on Oct 19, 2022
Since I started using Starline Brass I find my shooting is much better. This is all I use now. Either new or once fired.

Starline never fails to deliver!

By Aaron M. on Sep 14, 2022
Starline is some of the best brass you can buy, and it's at a great price too!

300 Blk Starline Brass. EXCELLENT!

By Frank W. on Sep 29, 2020
I've been using Starline for every pistol caliber I reload for. Since they're now producing rifle calibers too, I figured why not? Excellent quality. Consistent size and tight primer pockets. No worries here. Buy with confidence.

Starline 300 blackout brass

By John P. on Sep 29, 2020
I have used Starline brass which I purchased from Graf in many different calibers over the years for both my rifles and pistols. It has always performed very well for me and Graf and Sons has always had a good price on it as well. I shoot quite a bit and I have not had a brass related failure of any kind yet with Starline brass.


By . on Aug 26, 2020

Starline 300Blackout Brass

By Trevor S. on Jul 07, 2020
I am impressed with this brass. I took multiple measurements of 25 randomly selected cases (5 from each bag), neck od, case head to datum line, shoulder diameter, and web diameter. They were surprisingly consistent and would feel comfortable using this brass in competition, it’s very consistent from piece to piece. Highly recommend

Good brass

By Frank S. on Jun 26, 2020
92.1 grain consistent weight good brass

300 Blackout Brass

By Allen M. on Jun 25, 2020
It's Starline, what more needs to be said? Always top quality and this brass has been no different.

First time buyer

By Terry D. on May 28, 2020
This is my first time buying Starline brass. I normally buy hornady or Winchester brass. I bought two bags of 100 and was pleased to find both bags had 102 pieces. The brass seems to be as good as the other mentioned brands but costs less. The brass I brought is 300 blackout and I have loaded several rounds without any problems. Overall l am very pleased with my purchase.

starline brass

By Steven M. on Apr 03, 2020
I haven't tried these yet, but all the other calibers of starline brass that I have used work just fine.

very uniform

By Richard C. on Apr 07, 2019
AS with my previous purchases of Starline Brass, case weight is very uniform. No need to sort. My first choice in brass for quality at a reasonable price.
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