Aces High Bulletin Board
General Forums => The O' Club => Topic started by: Neubob on May 15, 2007, 10:52:59 PM
-
I was doing some research on large-caliber rifle ammunition when I came across the .50 "fat mac". I was wondering if anyone here has ever heard of it. It looks like a 20mm case shortened and necked down to a .50. The result is a 3400 fps, 750 grain projectile delivering close to 20,000 ft/lbs at the muzzle. I've yet to find a rifle to chamber this round.
Here's the illustration:
(http://accurateshooter.net/pix/cheechak05x600.jpg)
-
welcome back neubob
-
It looks like someone tried to do that super short case thing for which the name that I cannot remember right now. They tried to do it to some of the smaller calibers, and it wasn't incredibly popular.
-
Lazzeroni is the guy that is credited with bringing out the short, fat magnums. Winchester took that ball and ran with it. Lazzeroni, though, was undoubtedly influenced by the 6mm PPC developed by Louis Palmisano and Ferris Pindell.
The short fats are so incredibly unpopular that every major rifle builder is chambering them.
There's the .270, 7mm, .300 and .325 WSMs and then there's .223, .243 and .25 WSSms.
-
Well, they seem unpopular to me. I remembered several years back all these rounds coming out, and all the new guns being rechambered for them.
Then I've heard NOTHING for years.
-
Maybe you should get out more often. :)
-
BTW, I personally see no real need to nearly double the price of your ammo for the minimal accuracy gain and small increase in velocity.
But hey, the gun buying public is always chasing then newest way to down their game.
Which always turns out to be the old way: use enough gun and put the bullet where it needs to go.
-
Originally posted by storch
welcome back neubob
Thanks. Nothing like a nice relapse, eh?
-
the welcome back was not intended as a dig at you.
-
Here is a link to the specs....
http://ammoguide.com/?catid=445
-
Man, if That's a .50 cal, and that case looks to be about twice as big as the projectile, making the case at least an inch in diameter....That would make the chamber end of any barrel it's chambered for about 2 inches in diameter in it's outside circumference. That thing would look like a funnel.
-
Originally posted by storch
the welcome back was not intended as a dig at you.
I didn't think it was, Storch. If there was any cynicism in my response, it was strictly meant to be self-depricating.
-
The neck looks too short to adequately maintain projectile alignment, compression and secure the projectile from coming out of the case inadvertently
-
I'd like to see an unseated projectile for it too, Mav.
The one in the photo looks like it's already grabbing 1/4 in. of rifling before it's even fired. That would have to be one long bullet.
-
It depends on how much the throat is relieved in the barrel / chamber combination as to whether the bullet would touch prior to firing. Running the shell to contact with the lands on loading would really require consistent cartridge length and case length in all shells. That's OK for a competition rifle but bad news for a "working" rifle.
-
i heard the big reason that short mags are unpopular was because they wore out barrels much faster than a long skinny round..cause of stress of the neck down..im not sure if this is true or not.