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Heavy 348 Winchester Rifle Ammunition

SKU: 12A/20

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Heavy 348 Winchester Ammo - 250 gr. J.F.N. 
(2,250fps/M.E.2,810 ft.lbs.)
20 Round Box



Over the decades, I’ve owned six or seven rifles/carbines chambered for 348 Win. in the model 71. Four of those were the Browning reproductions made in Japan. It is easily evident that the Japanese reproductions are of higher quality than the original Winchester’s. Not only were all my Browning’s more accurate than the Winchesters, but the 20-inch carbine Browning, will give about the same velocity as the 24 inch Winchester rifle……..and the 24 inch Browning will give 100 to 150 fps more velocity than the 20 inch Browning version.

Browning Reproduction of Winchester Model 71 - 20-inch barrel


The Browning reproduction pictured above is my only remaining firearm chambered in 348 Winchester. With our modern 250 gr., 348 Winchester ammo, it generates roughly 2,250 fps. We’ve been making 348 Winchester ammo for almost 20 years as of this writing. (08-12-18) Over the years we’ve used AK Bullet Works 250gr. bullet, but they could never keep up with demand, so I switched to Hawk bullets but had issues with quality. After much testing, we’ve settled on the 250 gr. Barnes Original Bullet. It is very accurate and constructed stiff enough to not over-mushroom, but it still mushrooms fairly radically.

In 2013, Winchester quit making 348 brass, so we’ve been out of loaded 348 ammo since 2014. Enter Starline brass. I started bugging the good folks at Starline over four years ago, to make 348 brass. Well, they finally got it done and it is excellent brass.

Our single 348 Winchester load operates at or under the old SAAMI guideline of 43,000 CUP, so it is safe to use in any/all rifles thusly chambered, that are in normal operating condition. If you email me and ask if this load is safe to use in your rifle, “just to be sure”, I promise I will tell you nothing more than what is written here! So please save us both the time.

Having killed dozens of bears, including many grizzlies, I have formed an opinion or two on “bear” cartridges………Our 348 ammo is very capable of killing/stopping aggressive interior grizzly, which rarely weigh more than 600 lbs... Coastal grizzly, known as AK Brown Bear, when they are in AK, can weigh more than 1,000 lbs. and I see our 348 Winchester load as MINIMUM for such large coastal grizzly. This 348 load would be a great short range (under 250 yards) elk or moose load too. AK still has many a guide, and resident hunter carrying original Winchester model 71’s and we hope to provide those folks with quality ammo for decades, now that we can get brass.

Good shooting and God bless,

Tim Sundles

This ammo is safe to use in any Winchester or Browning Model 71 that is in good condition.  Chamber pressures are 33,000 CUP 

Item 12A - Exterior Ballistics Charts for several Muzzle Velocities


Muzzle Velocity @ 2300 fps for Item 12A


Muzzle Velocity @ 2200 fps for Item 12A


Muzzle Velocity @ 2100 fps for Item 12A


Muzzle Velocity @ 2000 fps for Item 12A


Muzzle Velocity @ 1900 fps for Item 12A


Muzzle Velocity @ 1800 fps for Item 12A

Field Proven rifle and gun ammo. Maximum firepower ammo. Best ammunition for rifles and guns for sale. Buffalo Bore. Strictly big bore. Strictly Business.

You must be 18 or older to order ammunition. Ammunition must ship UPS ground. Due to Department of Transportation regulations, we cannot accept returns on Ammunition. Make sure to use the correct ammunition in your gun. Check local laws before ordering.

Mike LeClair on 03/12/2022 07:07pm
Yet another fantastic load from BB. I recently had the opportunity to hunt free range Nilgai along the coast of Texas. I was provided with a shot opportunity at 126 yards. The bull didn%u2019t make it 50 yards after the shot and it had a full pass through. . The BB ammo combined with my Model 71 Winchester performed flawlessly. Thanks again BB.
Eric Lopez on 05/16/2009 08:12pm
This load is awesome! My first two shots group 2 in. at 100 yd., but my rifle seems to be heat sensitive. The group began to grow fast by the 5th shot.After my 6th shot I could'nt take the recoil. The recoil also pushed the bolt back, making ejection difficult, and damaging the brass.My Winchester 71 has been rated as "excellent" condition, and now I have an excellent load to match. Despite the brass and ejection concerns I'm certain this round will easily handle any beast on this side of the planet.Gotta go hunting now. Thanks Buffalo Bore ! .

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Friends and Customers, 08-18-20


All shooters are being inconvenienced with what is happening to our society and the rush it is causing on ammo supplies. We have LOTS of ammo in stock and are making more at a huge volume on a daily basis. If our web site allows you to order any item, that means it is in stock—WE DO NOT TAKE ORDERS FOR ITEMS WE DO NOT HAVE! So, please do not email and ask if items are in stock. If they aren’t, the shopping cart will not take your order.

We have hundreds of customers to get orders to on a daily basis. In order for us to accomplish this for our customers, we ask the following.

  1. Be sure of what you are ordering. You are going to get what you ordered.

  2. Do not contact us and ask to change an order you’ve already placed. When we manually change orders it requires a lot of time that we do not have during this rush and it keeps us from serving all of our customers. If you’d like to change an order, we can no longer do that till things slow down, so simply place another order for more product, but PLEASE, NO MORE CHANGES after the fact!

  3. We NEVER have and never will take ammo exchanges or returns and then turn around and re-sale that ammo to unsuspecting customers as factory new ammo—this is not safe nor is it fair to customers who are buying what they think is new and safe ammo. No ammo is tamper proof! So please stop asking to exchange or get a refund for ammo you ordered, but have changed your mind about.

  4. Please do not contact us and ask for tracking numbers or “when will my ammo ship”? Our system automatically emails out tracking numbers on the orders we ship each day, however, because these emails are coming from a corporation shopping cart, many of these emails may go to your spam folder……..please look there. If it is not in your spam folder, that means we have not yet shipped. At current order rates, we are shipping within 5-7 business days of the time an internet order is placed. Please sit tight. Your ammo will arrive at the same time if you track it or not and will certainly arrive later if we are swamped answering questions instead of getting orders shipped. When 30-50 people per day send emails asking for tracking information and we have to pull that information up, then type it out and email it, it takes a huge portion of our work day that we should be using to ship those orders to customers in need. Please leave us alone so we can serve all of you. (ship to you) It’s a bit selfish, during times of shortages, when so many folks need to protect their families, to slow us down because you ordered carelessly or want to change your order. Right now, we expect you to do your part to help us all get the ammo we need in our troubled country.

These measures are hopefully temporary and will not be needed for long as we enjoy the interaction with our customers, so please, for the time being, be mindful of all those others who are also trying to get ammo during what I think is a societal meltdown/emergency. Hopefully, we can serve you all. We want you and your families to be armed and safe and we wish you the best during these trying times. My biggest concern is that things will worsen yet more, for a while. Until things straighten out in our government and society, we will have to streamline our customer service in order to serve all customers. Thank you for your understanding.

Good shooting and God bless,

Tim Sundles

I Understand