Does anyone have the ballistics handy for that 20mm wildcat, fatcat, if I'm not mistaken.I haven't updated my barnes COTW collection for a while

Karl
Depends on which version. There's the high trajectory, indirect fire version and the high velocity, low trajectory version.
Jim

COTW #9
50 McMillan "FatMac"
A shortened 20mm case, necked down to 50cal.
510gr Barnes X, H50bmg, 386.3gr @ 3893fps
535gr Woodliegh, H50bmg, 387.0gr @ 3838fps
750gr Barnes Match, NC-A3502, 350.4gr @ 3385fps
750gr Horn. A-Max, NC-A3502, 351.5gr @ 3387fps
800gr Barnes Match, NC-A3502, 339.8gr @ 3280fps
All of the above data is from Quickload
figuring Moly coated bullets and a 42" barrel

I don't think thats what you wanted, but it's all I got.

[ 04-21-2003, 16:07: Message edited by: Tailgunner ]

FYI the one on the right is a 50 FatMac

The others, from the left side, are 30-06, 8 Bore, 700 NE, 50 BMG

Very interesting topic.

Will the MC MILLAN repeater action take the 20 mm case?

How would a 20 mm case necked down to caliber .700 be??? faster than the .700 BMG IMPROVED?

I want all info I can get!

Thanks!

I don't believe the McBros 50 cal rifle action can be used for the 20 mm case. http://www.shootingsports.com/mcmillan/rifle.htm#us
I had read about this cartridge in the Fifty Caliber Shooters Assoc magazine http://www.fcsa.org/ a few years ago, and have since heard through the grape vine that it provides no accuracy advantage over the 50 BM for FCSA match shooting. I would guess that is because of a lack of appropriate powders. Understand the 50 BM Improved has the same problem. FCSA members probably could get a copy of that article. At one time Klaus Horstkamp, of State Arms, made a falling block single shot action large enough for 20 mm. When I spoke to him he said he wasn't interested in making any more and he has since, tragically, passed away. I don't think East Ridge / State Arms Gun Co http://www.statearms.com/ makes the 50 cal falling blocks anymore either.

Thanks guys, I knew it was 'fat something'
Jim what are the versions? Different cases or loadings?

quote:

---

Originally posted by Overkill:
Very interesting topic.

How would a 20 mm case necked down to caliber .700 be??? faster than the .700 BMG IMPROVED?

---

Overkill you are asking then if a 12.7mm case is more powerful than a 20mm case?

Overkill- Just think, A 12 guage from hell could be built on a 20MM case without the need for a Belt! You'd just have to find an action big enough for it. I don't know of any commercially available.!! By the way, I think both a FatMac and a .50BMG IMP are legal for unlimited class FCSA matches as long as the bullet diameter is .510. I don't remember the rules on heavy class, but they are illegal for light class.-Rob

Copper country,
Thanks- had a look at State arms gun co website. What is the opinion of their quality/reliability etc?
I notice their 50 BMG's start at only $1800 or so.

Karl.

Karl:
I don't know about State Arms http://www.statearms.com/ quality with the new owner. It could be quite good but I just haven't heard. Klaus, the former owner, was held in high regard by the FCSA folks and I like both the design and construction of the 50 cal bipod I got from him at one of the shows. The FCSA site http://www.fcsa.org/vendors.html would be the best place to get some info on the different rifles available now. Kind of depends if you want something for competition or fun. Most of the high end competitors shoot McBros actions http://www.mcmfamily.com/ . Cost seems to be no barrier to some of these folks. Wish I could say that, but such is not the case. In the lower cost range, the LAR Grizzly http://www.largrizzly.com/ is competitive because of the concentric barrel and action. Lower cost yet are the add on barrels to AR-15 lowers http://www.watsonsweapons.com/ . I don't know if Watson's are, but think some brands are made from surplus machine gun barrels. May not be MOA accurate but fun to shoot none the less. Some other companies are http://www.barrettrifles.com/ , which are really cool and really pricey, http://www.serbu.com/bfg50.htm , http://www.edmarms.com/main.htm .

[ 04-22-2003, 16:03: Message edited by: Copper Country ]

The fat something is a short something also.
Shortness craze in 20 mm cases kind of silly.
Bob Snapp my gunsmith neighbor here, has a 20mm
necked to 50 cal that is full length.Gets 750 gr
AP Ball over 5000 fps.Used as experiment to test armour.I try to get a pic.Ed.

Hubel458!

What weight does that rifle have? And what action?

Overkill-it was used in a big stationary universal
reciever test unit.Not light enough to carry.Ed.

Has any one taken the 50BMG and shortened it and improved the shape? So it would have the same or slightly less capacity then the regular BMG, but with near strait sides and a 30-40 degree sholder?

Kristofer

Overkill, the actions designed for the 20mm are not surprisingly 20mm actions.
The first 20mm , the anti tank rifles weighed from 70-200lbs and developed 30 000- 40 000ftlbs muzzle energy with projectiles weighing up to 1/3 pound.

Still, in the world of military calibres they are pipsqueaks, and generally too small to have any effect on modern armour.

Trust me mate.The 50BMG/15mm cases(and comparable capacities/pressures/wildcats) is a good 'arbitrary limit' for what I call "crazy man portable , occasionally line up a hog, fun bores".

There is no other secret holy grail of bigbores we are not telling you about.

They just keep getting bigger and heavier and less portable after this.

Karl.

Since we are getting extreme here, the following shows one of the 20 mm cases and rifles:

From: http://homepage.mac.com/bloodfield/html/cart_html/cart223_20.html


From: The Gun Zone http://communities.prodigy.net/sportsrec/gz-lahti.html (Not Me)

Wish I could get to shoot one of these some time or another but it is past the scale of Dangerous Game Rifles.

The skis are pretty cool though!

See Ohio Ordnance Works http://www.ohioordnanceworks.com/lahti/l.htm if you want to buy one!

Great pics and links Copper.
I wonder how much further he walked from his vehicle with that 90lbs!

Actually on DGR(sort of)the various antitank rifles had a rebirth for a while- As finishers on whales already anchored by explosive harpoons. Now we are getting extreme

Seems they didn't do a lot better than regular rifles.A brainshot is a brainshot and anything else doesn't really impress such large animals.

Karl.

Karl:
Bet that made the Greenie's blow their tops. Brain Shots on Whales! Wow! How Non Politically Correct can you get.
Sounds like they found out what everyone should know, shot placement is #1.
Thanks,
Mike

Here is a tall and fat version--50 cal first--
20mm/50 cal second--20 mm third. Ed.