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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.

Christopher McCourt on 01/24/2023 02:26pm
Fired a couple mags of 21C out of my Smith&Wesson M&P 2.0 4.6%u201D barrel. I didn%u2019t have any loading issues or malfunctions. Very pleased with this ammo. I know there are a lot of videos of 220 grain ammo not loading or malfunctioning in a lot of 10mm weapons. This was flawless in my pistol M&P 4.6%u201D pistol.
Robert Greene on 01/11/2020 05:37pm
Follow-up Review, tested in SigP220 Legion, Kriss-Vector 'pistol' with 6.5" barrel:
Very Consistently loaded for such hot ammo, the K-V and a SIG Romeo dot sight was dead on. My Son shot this in the P220 and did well with it. G20 with LWD long slide, LWD 6.6" barrel, 3.5 oz Seattle Slug Plug (fit in glock grip void) makes these and even 255gr 460 Rowland shoot like a breeze. I could shoot 10mm all day in that set up!
STILL 5 STARS, maybe even six? %uD83D%uDCAA%uD83D%uDC4D
Scott L on 05/18/2018 07:45pm
Fired 40 rounds through my RIA 1911 A2 in 10mm. 5" barrel and i believe the stock recoil spring is 20lbs. Stout ammo, but nothing too dramatic thanks to the weight of the all steel frame. I didnt measure the groups, but at 10 and 15 yds these were grouping quite nicely. This was the first time i had fired the new 1911, so i was worrying more about the feeding/reliability of this, as well as some personal protection and range ammo. I have no doubt that the 220gr Outdoorsman bullet will get the job done in the back country.
A. K. on 03/19/2018 07:53pm
Fired several magazines of 21C through a Glock 40 with a 22lb Glockmeister Recoil Spring and a longer KKM threaded barrel. No jams and had about a 3-4 inch group at 15 yards firing a little less than rapid but not slow. The recoil was a little less than the .45 Super Outdoorsman (45S255) that I use in my Glock 21. This is an extremely powerful round and while I would not substitute this for my revolver in a bear defense situation, I have no doubt that this ammo would drop any bear. providing you got the chance to defend yourself.
Robert Greene on 02/16/2017 05:07pm
These did pretty good out of my G20C in factory trim, I am a novice shooter and got a 7" to 8" group of 15 at 10 yds. which I was pleased with, because it was rapid fire and such stout ammo. You better believe this is STOUT AMMO! I used an LWD 21# spring later, along with their 6.6" barrel, and the gun shot much better with every ammo, but I did not retest the 220gr yet. I am hoping for a much smaller group, especially if I slow down and reacquire the bullseye ;)
I'd say this is worth the money, but I have not tried the Underwood yet. 5* as a stand alone test!

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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