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.300 WIN MAG

Shop New and Certified Once-Fired .300 Win Mag Brass

Looking to hone your precision on the range? Diamond K Brass proudly presents its premier .300 Win Mag Brass. We're a game-changer in the world of reloading components. Our brass delivers consistent performance and durability to ensure you hit the mark every time.

Precision-Crafted Features of .300 Win Mag Brass

  • Reliability: Meticulously sourced and inspected to ensure uniformity and consistency
  • Durability: With superior strength, our brass can withstand multiple reloads without compromising accuracy
  • Consistency: The uniform dimensions of our brass guarantee uniform pressure and velocity to allow for tighter shot groups and enhanced performance
  • Ease of Use: The smooth and clean finish ensures easy resizing and reloading, streamlining your ammunition preparation process

Take Your Shooting Game to the Next Level

At Diamond K Brass, we understand the passion of shooters. This is why we offer high-quality brass options, catering to your specific needs. Our commitment to quality extends to each of our ammo products. Stock up on .300 Win Mag Brass from Diamond K Brass today. We provide custom ammunition tailored to your needs.


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.300 WIN MAG 100+

.300 WIN MAG 100+

 Yellow Brass and Nickel Casings

*Complimentary Tumble Polished*

$70.00

 
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.300 WIN MAG Nickel 100+

.300 WIN MAG Nickel 100+

Mixed Head-Stamps

*Complimentary Tumble Polished*

$80.00

 
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Testimonials
Ordered 4, 100 count bags of commercial .223 nickel plated casings to make up some varmit ammo. Didn't have any prep work done to Them. They arrived 3 days from date ordered. They were very clean and needed no tumbling. Very very pleased with the quality of the casings!!! The shipping was the fastest of any vendor that I've ordered from in many years..
These folks are my new go-to company for all my brass and tumbling supplies. Price is right and shipping is extra speedy! Can't beat the quality of the brass.
Phil Archer
Aug 6, 2014
This last order 500 ACP mixed resulted in a 2/3 large primer and 1/3 small. Two .44 casing and one .40. One damaged. Already polished and sized. A+. 500 >38 specials tear downs 40 with defective primers no damaged cases. One .357 in the mix Oh my. A+ 500 9MM tear down 30 miss primer. Two bad casings a couple of hollow point bonus. A+ What can I say except Excellent!!
eric bjurstrom
Sep 21, 2020
Ordered 100 357 mag cases and 100 bullets on Wednesday at 9:20 am. Got an email at 12:10 pm that the order was shipped!
Unbelievable fast shipping - received the order in four days.
When I opened the package the plastic bags had opened in the shipping box but I didn't loose anything.
Counted the brass and got 110 pieces - of those one was 38 special kind of expect this from time to time and 5 that had been reloaded and not once fired. All in all got 104 pieces of good nickle 357 mag brass at a good price and again the fast shipping.
Will definitely buy again from Diamond K - now I just wish they carried .357 Max brass as that would be outstanding!
Guy S
Apr 6, 2016
I have ordered multiple times from Diamond K and I've never been disappointed. I placed an order on Sunday and I received my brass on Wednesday morning in Nebraska.
I cannot swear that all the casing are fired only one time because some of the primer pockets are fairly dirty, but I always clean my primer pockets before I re-cap the brass.
I plan on obtaining my brass from Diamond K as long as I continue to reload. The price is very reasonable.
Terry Loehr
Sep 18, 2014
A few weeks ago I had ordered 1000rd ea of .9mm and .223 and got another 500rd of FREE .9mm. The Free 500 rounds of brass was just the icing on the cake. I was very pleased with my order and it arrived mui pronto too. I just ordered a 500 rd each of .357's and .223 and I get another 500 free rds of .9mm for fathers day. You guys are keeping me happy. I will continue to come here for all my brass. thanks guys
Mark Robbins
Jun 16, 2017
I came across this outfit via an interweb search. I ordered 1000 LP .45 ACP brass, unpolished, unprocessed, etc. Shipping was prompt, I reieved the brass 3 days after my order along with a tracking number notifying me the order had shipped. I didnt count the brass however I have no doubt that there is at least 1000 in the box that was sent. Also, the brass arrived very clean despite it not being processed. Very pleased, will purchase again from Diamond K!
JL
May 26, 2018
I always buy brass from Diamond but can never find a history of the purchases. Oh well, the brass comes in when I expected it but it would be nice to be able to look up past orders. I hope someone tells Diamond K how to make that happen.
Billy C Wilson
Apr 17, 2015
I purchased 5000 .45 ACP brass and so far I am pleased. There were no other cases in the order and so far only 1 I couldn't use.
The cases were clean and not to many with small primers.
Scott Dunk
Jun 5, 2016
I ordered 50 nickel plated 308 win commercial hs. Shipped quickly and the price was great. Enjoyed everything enough that I just ordered 500 yellow brass 308 win comm hs.
Ron Whitehead
Apr 16, 2019
Bought some AK brass during the COVID-19 shortage. Fair prices, shipped almost instantly. Back now that they have bullets in stock! It doesn't get better than DiamondKBrass!
Joe G
Apr 17, 2020
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