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500 AUTO MAX Ammunition

SKU: 500AM 350 JHP/20

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500 AUTO MAX Ammo
350 gr. JHP @ 
2,300fps/M.E. 4,110 ft lbs
20 Round Box

ITEM 500AM 350 JHP


I was approached by Greg Buchel of Big Horn Armory and asked if I would produce this cartridge for Greg’s upcoming new series of AR 10 carbines. At the time of this writing, (03-18) the 500 Auto Max is the most powerful cartridge made for use from any AR platform. This cartridge is simply a 500 S&W casing with a slightly smaller rim. 500 S&W load data can be used to make this cartridge, but care must be given to powder selection to keep from gumming up the AR action. I’ve thoroughly enjoyed testing and developing loads for this cartridge.

I admit to being a generation behind on what is stylish in any industry………..In my generation, if we went fishing on a salmon choked, bear-infested stream in AK, we carried a powerful lever action (normally chambered in 45-70) rifle, pump shotgun with slugs, or often a bolt action rifle with iron sights was deployed. Powerful big bore revolvers were also the norm in such situations. If we were in the woods at all, we were carrying such firearms, but we never saw AR’s in the woods, back then. However, these days, shooters have grown up with the AR platform rifles. Honestly, a lightweight AR, with about 8-10 rounds of firepower on tap, chambered in 500 AM, would be very effective against giant bears. How can a 400+gr., .50 cal. bullet going around 1,900 to 2,100 fps not be effective on 1,000+ Lb. bears?

An added benefit to this cartridge is that it will chamber and fire in any revolver or single shot chambered for the 500 S&W. The reverse is not true, which means you cannot fire 500 S&W cartridges in a 500 AM chamber. In revolvers, please remember that the 500 AM headspaces on the case mouth, so it has no roll crimp and it can/will jump forward if subjected to the recoil of only a couple firings……this is not an issue in any single shot.

We will eventually cover all the ammunition bases for this cartridge, from a very heavy (600-700 grs.) sub-sonic load to lightweight speedy JHP bullets. This may take a few months as Greg is not yet due to release production rifles for another couple weeks. Folks will be tempted to gauge the effectiveness of this cartridge based on Ft. Lbs. of kinetic energy, but doing that is very misleading regarding anything that matters when killing big animals. Please read this article, BULLET “ENERGY” (ft-lbs) VERSUS “TKO” EFFECTIVENESS ON BIG GAME

So far, we have developed three 500 AUTO MAX loads and they are as follows;

1.  Item 500AM 400 JFN----which is a 400gr. JFN bullet @ around 2,050 FPS
2.  Item 500AM 350 JHP----which is a 350 JHP bullet at around 2,300 FPS
3.  Item 500AM 440 HC-----Which is a hard cast (22 BHN) bullet (not lead) at around 1,900 fps.

As soon as Greg starts to release production rifles, we will have quantities of these three loads available to the public. We will add a new load or two each month until we have covered all the bases for any type of ammo need. Stay tuned and thank you.

Item 500AM 400 JFN is designed to be an all-around load for African or North American big game. Any critter the size of bull AK/Yukon moose (1500 or so lbs.) or smaller would be the kind of animal this load is made to dispatch. I would even use it on whitetail deer if that meant I did not have to re-sight my rifle with another load just for deer but remember this load will over-penetrate on animals of deer size and will kill whatever is behind your target animal if anything. In my singular test gun, velocities were right at 2,000 fps.

Item 500AM 350 JHP is designed for critters under 600 lbs. and I’m sure it will kill much larger animals if you put that bullet in the right place. This bullet will likely disintegrate on big shoulder bones at close range, but as your range increases, impact velocity will decrease. So hit a critter beyond a couple hundred yards and this bullet will have slowed enough that it probably won’t disintegrate on big bones. In my singular test gun, velocities were averaging 2278 fps.

Item 500AM 440 HC is designed for the biggest and most dangerous of North American or African animals, excluding elephant, which in my opinion has too thick and hard a skull to be shooting with even the best hard cast bullets. This bullet/load will work great on animals up to about 3,000 lbs., as it will not expand and will, therefore, penetrate deeply and straight. This bullet is the same bullet we use in two of our 500 S&W loads so we know it well. It is gas checked. It is also alloyed and lubed properly and will not cause lead fouling. The loaded cartridge looks weird because we are seating the bullet out of the casing past the crimp groove. We do this because the cartridge headspaces on the case mouth and if we seated the case mouth to the center of the crimp groove, it would be possible for that case mouth to get bent/dented into the crimp groove and cause head spacing issues—when we seat that case mouth onto a part of the bullet shank, the case mouth cannot be dented or squeezed into anything, thus assuring proper head spacing. Seating the bullet further out also allows us a bit more case capacity for two or three more grains of powder capacity. This is a very accurate hard cast load in my test rifle. In my singular test gun, velocities averaged 1,880 fps.

Item 500AM 350 JHP - Exterior Ballistics Charts for several Muzzle Velocities


Muzzle Velocity @ 2700 fps for Item 500AM 350 JHP



Muzzle Velocity @ 2600 fps for Item 500AM 350 JHP



Muzzle Velocity @ 2500 fps for Item 500AM 350 JHP



Muzzle Velocity @ 2400 fps for Item 500AM 350 JHP



Muzzle Velocity @ 2300 fps for Item 500AM 350 JHP


Muzzle Velocity @ 2200 fps for Item 500AM 350 JHP


Muzzle Velocity @ 2100 fps for Item 500AM 350 JHP


Muzzle Velocity @ 2000 fps for Item 500AM 350 JHP



Muzzle Velocity @ 1900 fps for Item 500AM 350 JHP


Muzzle Velocity @ 1800 fps for Item 500AM 350 JHP


Muzzle Velocity @ 1700 fps for Item 500AM 350 JHP



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.

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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