Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Member Login
Posted: 2/2/2006 6:56:33 PM EDT
i want a round that goes a hundred milliion fps and has a flat trajectory out to a million billion yards or so. what round would this be? does anyone make a 20mm case necked down to .17 ?
Link Posted: 2/2/2006 6:59:02 PM EDT
No, but I think somebody necked down the .50 to .224"
Link Posted: 2/2/2006 7:07:28 PM EDT
[Last Edit: 2/2/2006 7:07:47 PM EDT by LVMIKE]
I've heard .220 swift to be a VERY fast round. In the neighborhood of 4000fps... Not sure if it's the fastest though...
Link Posted: 2/3/2006 5:58:55 AM EDT
Weren't there tapered bore rifle rounds (based on the 28mm German anti-tank cannon) available in the '30s?
Link Posted: 2/3/2006 6:02:01 AM EDT
[Last Edit: 2/3/2006 6:02:47 AM EDT by CajunMojo]
[guess].204 ruger [guess]

isn't that faster than the .17?
Link Posted: 2/3/2006 6:02:48 AM EDT
Link Posted: 2/3/2006 6:05:21 AM EDT
.204 is 4225 fps
Link Posted: 2/3/2006 6:07:48 AM EDT
Rail gun from "Eraser". The projectiles velocity were near light speed.
Link Posted: 2/3/2006 6:09:37 AM EDT

Originally Posted By CajunMojo:
[guess].204 ruger [guess]

isn't that faster than the .17?


Yeah,last I read the .204 is the fastest commercial round available. However (without looking at a ballistics table ) I don't think it is THAT much faster than the 220 swift.
I thin I heard of the Navy doing test on a rail gun that is supposed to be accurate out to soem crazy distance of 300 nautical miles or some stuff like that. I'd say that thing would have to be traveling pretty quick.
Link Posted: 2/3/2006 6:10:25 AM EDT
rbcd.net/Special%20Application%20Ammo.htm

200 grain RBCD 50BMG - 5900 FPS
Link Posted: 2/3/2006 6:11:26 AM EDT
The limit for gunpowder driven projectiles is about 6,000 fps. These speeds have been achieved with experimental weapons and rounds. At such velocities, barrel erosion is, shall we say, rather severe.
Link Posted: 2/3/2006 6:14:37 AM EDT
6000 fps is pretty damned fast!
Link Posted: 2/3/2006 6:17:00 AM EDT

Originally Posted By coondog:

Originally Posted By CajunMojo:
[guess].204 ruger [guess]

isn't that faster than the .17?


Yeah,last I read the .204 is the fastest commercial round available. However (without looking at a ballistics table ) I don't think it is THAT much faster than the 220 swift.
I thin I heard of the Navy doing test on a rail gun that is supposed to be accurate out to soem crazy distance of 300 nautical miles or some stuff like that. I'd say that thing would have to be traveling pretty quick.



HUH?!?!?!?!

Sorry, but that sort of messes with the line of sight theory and curvature of the earth etc.....
Link Posted: 2/3/2006 8:34:20 AM EDT
some of those speedy rifles burn barrels very very quickly
Link Posted: 2/3/2006 8:40:11 AM EDT

Originally Posted By LoginName:
Rail gun from "Eraser". The projectiles velocity were near light speed.



Funny how the people shooting them weren't thrown backward at about 10,000 mph....
Link Posted: 2/3/2006 8:52:14 AM EDT

Originally Posted By PsyWarrior:

Originally Posted By coondog:

Originally Posted By CajunMojo:
[guess].204 ruger [guess]

isn't that faster than the .17?


Yeah,last I read the .204 is the fastest commercial round available. However (without looking at a ballistics table ) I don't think it is THAT much faster than the 220 swift.
I thin I heard of the Navy doing test on a rail gun that is supposed to be accurate out to soem crazy distance of 300 nautical miles or some stuff like that. I'd say that thing would have to be traveling pretty quick.



HUH?!?!?!?!

Sorry, but that sort of messes with the line of sight theory and curvature of the earth etc.....



Satellite mounted?
Link Posted: 2/3/2006 9:08:11 AM EDT
[Last Edit: 2/3/2006 9:08:55 AM EDT by danonly]
Mic McPherson and Byrom Smalley have designed their SMc line of cartridges to be highest performers they could get with modern primers and propellants.


.... I am using a 1/16 twist Pac-Nor barrel on my Savage Custom Shop 5/35. Ballistics and accuracy with the 32-grain Sierra BK are impressive, to say the least. See associated ballistics graphs. I can suggest that anyone planning a custom 5mm might want to consider a 1/14 twist for use with light bullets.

Recoil is so modest that I can literally see the paper slap when the bullet hits it at 100 yards! I have modified the stock on this gun to reduce muzzle climb (I changed the taper angle on the foreend and the buttstock), which helped in this regard – the gun hardly moves anyway. This is my new varminting combination. When one considers the ballistics, it is hard to see what could be better: BC = 0.22; velocity = 4650 fps.



32 grain 204 caliber bullet at 4650! and it will be a factory round soon, i hope. Savage is already offering the chambering as a custom shop operation.

just a note- as i understand it, the 5/35 SMc designation means 5=bore diameter 35= usuable case capacity (to base of neck) S= Smalley Mc= McPherson

more info here www.superiorballistics.com/ although it seems to me the web site is not yet displaying graphics.

Link Posted: 2/3/2006 9:17:51 AM EDT
Doesn't Lazzeroni have some quick bullets?
Link Posted: 2/3/2006 9:20:40 AM EDT
[Last Edit: 2/3/2006 9:22:14 AM EDT by USGI_45]
I always thought the .257 scramjet was pretty impressive. Fires a 85Gr bullet at 3975fps
The .284 Firebird fires a 120gr bullet at 3900fps
Link Posted: 2/3/2006 9:20:56 AM EDT
Winchester super short magnum 243, WSSM 243, they report 4100 fps, Olypic arms is making an AR upper for these, but I did hear the bbls weren't holding up for very long.
Link Posted: 2/3/2006 9:30:01 AM EDT
The Sandia Labs Z accelerator has magnetically 'flicked' dime-sized projectiles at up to 34km/sec.

One of the applications is kinetic energy weapon...now if they can just get it portable.
Link Posted: 2/3/2006 9:33:53 AM EDT
I want the gun from the movie "eraser"...
Link Posted: 2/3/2006 9:36:32 AM EDT
Particle accelerator at Fermi Lab.
Link Posted: 2/3/2006 9:37:21 AM EDT

Originally Posted By Observer:
The Sandia Labs Z accelerator has magnetically 'flicked' dime-sized projectiles at up to 34km/sec.

One of the applications is kinetic energy weapon...now if they can just get it portable.



Yeah...dragging that extension cord behind you can be a bitch
Link Posted: 2/3/2006 9:37:54 AM EDT

Originally Posted By wolfman97:
rbcd.net/Special%20Application%20Ammo.htm

200 grain RBCD 50BMG - 5900 FPS



Top Top