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Offer good in Lower 48 States Only


HEAVY 10MM OUTDOORSMAN Handgun Ammunition

SKU: 21C/20

Qty: - +
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HEAVY 10MM OUTDOORSMAN -  220 gr. Hard Cast - FN
(1,200 fps/ME 703 ft. lbs.)
20 Round Box


Item 21C (a 220gr. Hard Cast plain based LFN) is the absolute heaviest bullet that can be fired through 10mm pistols. With its flat nose, it will penetrate straight and very deeply into muscle and bone. Straight line penetration into living tissue will exceed three feet.
Please note below, my personal velocities taken from real pistols.
➤  1140 fps - Glock model 20 4.6-inch barrel
➤  1175 fps - Colt Delta Elite 5-inch barrel
➤  1201 fps - Para Ordnance 1911 with Nowlin 5-inch barrel     

Item 21C is designed for all 10mm pistols that are in ordinary working condition.

Item 21C - Exterior Ballistics Charts for several Muzzle Velocities


Muzzle Velocity @ 1500 fps for Item 21C


Muzzle Velocity @ 1400 fps for Item 21C


Muzzle Velocity @ 1300 fps for Item 21C


Muzzle Velocity @ 1200 fps for Item 21C


Muzzle Velocity @ 1100 fps for Item 21C


Muzzle Velocity @ 1000 fps for Item 21C


Field Proven pistol and handgun ammo. Maximum firepower ammo. Best ammunition for pistols and handguns 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.

WyoGunner on 09/15/2013 12:34pm
Will not fit in a Lone Wolf Barrel. The case has too much bulge from the heavy slug. I am still a Buffalo Bore fan. I use it in my .460 Rowland. Would fit in a stock barrel.
rambouillet on 08/21/2013 11:19pm
Glock 20SF. Factory length barrel. Took down a 350lb rambouillet at 30 yards on the run. 1 shot and it was down with a clean entry and exit hole. Went through wool, rib, lung, spine, lung and again through wool. He took 1 step and was down. Another shot in the brain to finish the job. Looked for the bullet but couldnt find it. Buffalo bore 220gr hard cast is dead accurate and stabilized in factory barrel. I tried another popular brands 230gr hard cast 10mm and it didnt stabilize and was inaccurate in the factory barrel. The other brands 230gr accuracy was fine in my LW 4.5" but didn't reliably feed. Buffalo bore makes a great round, but little pricey for only a 20 round box.
Scott M on 06/01/2013 10:16pm
I needed a 3/8 hole in a piece of 1/4 inch sheet steel. Location specific but did not have to be perfect. I was jury-rigging a foundation plate for mounting a block and tackle on my mother-in-laws pole barn. Drill bit broke with the last hole. I let it get to hot for too long. Anyways, time to improvise. I had these in my CC Glock 29. My mother-in-law, the wife, and a couple other people thought I was nuts. Probably am. I took the shots from about ten feet away from behind some cover and wearing a welder's mask. It suffices to say they did the job. Two neat little holes. No long pain in the a** trip to find a steel bit that late on a Sunday.
Locke Mellott on 11/07/2012 10:03am
I used this load on a whitetail doe who was below me a few feet and slightly quartering away at 15 yards. The 220 Hardcast bullet entered the undisturbed and feeding animal's shoulder crease and made a .40 caliber entrance hole I could not quite get my finger through. It left a thumb sized hole in the ribcage, and broke an inch chunk out of one rib. It clipped the top of the heart and the hole in the soft tissue looked to be about the diameter of a Sharpie marker. The bullet exited low between the far shoulder and neck, and I could not quite get my finger through the .40 caliber exit hole. At the shot she pulled her head up and took about five jumps before looking back to see what the fuss was all about. She stood there for about three seconds, and was down for the count. I would estimate the total time from shot to complete stillness to be seven seconds. The penetration was perfectly straight line and I could not have been happier. I am not a handgun hunter per se, and have only shot one other whitetail with 180 grain Hydra-Shocks. Those hollow point bullets were such a disappointing eye opener, and I began to search for a different projectile for use on big game.

I am very pleased with both Tim and his company, and he has taken the time to email me back on my lengthy and specific questions, which is very appreciated and noticeably different than most ammunition manufacturers out there.

I give Buffalo Bore Ammunition a top shelf rating!
Joshua Needham on 10/09/2012 09:09pm
I trust nothing other than Buffalo Bore 220 Grain 10MM bullets when I step into the dark woods. There is no other manufacturer that produces a quality round like this one that will protect you from the largest North American meat eaters! GREAT Ammo!
Arch on 06/26/2010 08:44am
The bullets used in this load have a small shoulder just ahead of the case mouth. When fully chambered In my S
T Outlaw on 03/13/2010 10:39pm
1197fps average out of a G29 with a KKM 4 3/4" barrel.

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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