5,280 FPS ???

Load 1200 in caliber .22-250 Ackley Improved

LoadID 1200
Bullet Berger MEF
BulletWeight 35 grs
Powder Vihtavuori N135
PowderWeight 46 grs
Primer
Brass Make Remington
Barrel Length (inches)
C.O.L (inches)
Velocity 5130 fps
Group 0.929 (inches by 3 shot at 100 yds)
Submitted Date 3/18/2002 1:25:00 PM
Submitted By
Gun Info
Comment

Energy 2041 ft-lbs
TKO 5.69
OGW 248 lbs
IPSC PF 1147


Bullet Berger HP MEF
BulletWeight 30 grs
Powder Alliant Reloader 15
PowderWeight 50 grs
Primer Federal 210
Brass Make Winchester
Barrel Length (inches)
C.O.L (inches)
Velocity 5278 fps
Group 0.554 (inches by 3 shot at 100 yds)
Submitted Date 3/18/2002 1:06:00 PM
Submitted By
Gun Info
Comment

Energy 1852 ft-lbs
TKO 5.02
OGW 198 lbs
IPSC PF 158.34


Jim243-- my 8-32 x56 can see a 3 inch circle at 1400 yards very good.
 
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That picture looks like it would be the style in Akleys load books.
I believe I came across such a load with your 5200>fps. speed in a webb sight that had all kinds of wild cat case specs. Although that was in my crashed hard drive. I my self don't see any thing practical use around here for that type of load. I bet it can be real hard on the ears.
 
The US Army did testing, many years ago, with ultra high velocity cartridges, out of rifles. I don't know a lot of the details, but I remember that something like 7000 fps was achieved.

Though interesting, nothing of practical value was obtained. Plus, the barrels on the test rifles, if I remember correctly, only lasted a few hundred rounds, at most.

This came from the Guiness Book of World Records....many years ago.
 
Think the "Eargesplitten" cartridge was spoken of (and maybe pictured) in one of the Dean Grenell's "ABC's of Reloading".

My interest in velocity is at the opposite end: what can be done at the lower end of velocity and sound (quieter is better), with effectiveness. Why? Maybe the constant ringing in my ears, that I attribute to my stupidity in not wearing hearing protection when I was young (plus the .357 mag loads, w/WW 296 loads cracking, etc.)
 
jim243 said:
Because of air friction, all bullets will slow down at some point in their travel they will go from supersonic to subsonic during their travel so any measurement of 5,200 fps would only be at the tip of the barrel. Along with the pull of gravity downward it might be a physical impossibility to get a load that would give you the results you are looking for
Click to expand...

The max speed measurement of ANY bullet on earth is at the tip of the barrel. They all begin slowing down the instant that they leave the barrel.

The pull of gravity has nothing to do with the velocity of a bullet fired level on earth. However, if you fire the bullet upwards it will slow down slightly faster, if you fire the bullet downwards it will take slightly longer to slow down.
 
Fastest I have gotten was 4700 fps with a 36gr varmint grenade in a 220 swift with a 26" barrel 1-16" twist. Accuracy was not that great. It likes 40gr vmax at 4500fps. The 4700 fps load had a fairly stout bolt lift. I only shot a few.



05-17-07_1904_zpsa2jxhlkl.jpg
 
The .17 Remington came close,,,

The .17 Remington came close,,,

Factory ammo gives an average of 4,145 FPS.

Way before I knew what I was doing with rifles,,,
I won one of these rifles w/scope in a poker game.

I was stationed TDY at the USAF Seismic Research Station,,,
Located in Pinedale Wyoming.

The detachment was way out in the middle of nowhere,,,
The detachment Rod & Gun club had a very nice range set up.

Shooting that rifle was like using a laser beam,,,
It literally vaporized prairie dogs at 300 yards distance.

Old hat to you dedicated reloaders and varminters,,,
But to a young man with only experience was old milsurps and .22's,,,
That shooter was the single most amazing rifle I had ever had the pleasure to fire.

Could this be pushed to that 5,280 FPS?

Aarond

.
 
The gasses produced by burning gun powder, nitrocellulose, are generally right at the 5,200 fps velocity so that is considered the "theoretical maximum" for velocity when approaching 100% efficiency of velocity transfer to the projectile.

Sabots have been used to create a low for caliber mass low friction projectile to get there.

One other way around this is to use the property of fluid dynamics which states that for an equal volume to travel through a smaller vessel the velocity must increase to move the same amount of fluid in the same time. This is why the "squeeze bore" barrels were used. I've read accounts of 50 to 30 caliber squeeze bore M2HB variants being used in Vietnam with decent success, and the Germans used a squeeze bore anti tank rifle system in WWII.

Jimro
 
The pull of gravity has nothing to do with the velocity of a bullet fired level on earth.
Click to expand...

Really, Sir Isaac Newton might take exception to that comment, as well as the Army Corp of Engineering. I've never met someone from the "Flat Earth Society" until now, where is this piece of level ground you are talking about? And what was the gravity neutralizing properties it was made of. I was unaware of any bullet make of anti-gravity materials, UFO's might have that abilities, but i am unaware or Hornady or Speer developing any.

Stay safe and grounded to earth. Well, I guess you do not get an option on that. Since everything on earth is traveling at 1,000 miles an hour and you haven't flown off into space yet.. You need to be traveling at over 17,000 miles and hour to neutralize the effect of gravity on earth.

Jim
 
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I deep throated the chamber in my Red Ryder to accept a 50 BMG case necked down to .177 . Bad sun angle so my Alpha Chrony wasn't working, but i'm guessing about 8000 fps judging the vapor trail. I'm running titanium nitride coated fmj round ball. Rifle kicks butt at 50ft, only issue is after 1 shot the barrel is burnt out. :D
 
Indeed. For a projectile to do 5280 f/s on average, over a time of 1.0 seconds would likely require an initial velocity in excess of 8000 f/s. That's a little shy of 5500 mph. It makes me envision a usable barrel life of 20 rounds.
 
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