any one ever thought of a new round

[grprecon]

id just like to hear if anyone has ever thought of a new concept caliber bullet nothing that's been produced just something like a necked-up or necked-down round like a .30-06 necked to take a 9mm i saw it on another forum would it be possible to neck a .50gi for possibly a .357 or .44 mag for a 1911 drop in platform or neck a .50gi for a .30 carbine

[hickstick_10]

you mean the 35 whelen?

[Jim243]

I thought of the 257 and the 260 but they were already taken.

[grprecon]

would a .357 casing shortened or a 5.7x28mm casing necked to take a .223 or 5.56 bullet work for a auto-loading handgun for metallic shooting or competition

[hickstick_10]

you mean the 224 GNR?

http://www.reedercustomguns.com/info...cartridges.htm

Rather then make guesses out of thin air, spend some time googling your potential inventions, chances are its been made and dies are available.

[Brian Pfleuger]

I've thought of a few things that seemed like fun, but I don't know if they're taken already.

Most recently, the .308 necked down to .204. Seems like 5,000fps would be cake.

[hickstick_10]

wonder how the long the barrel would last on that number?

[IllinoisCoyoteHunter]

By the time you got it sighted in the barrel would be shot...

[zippy13]

What about the 270?

[hickstick_10]

50 BMG necked down to .17

Theres a chambering you wont find anywhere.

MOAR VELOCITY!!!

[woods]

I'm going to do a 375 Ruger necked down to a 30 caliber

[Jim243]

Zippy, what about the 270?? Mine shoots great.

GRPrecon, it's called a 5-seven and is made by FNH, a bit expensive at $1,000 or so.

peetza, if you use a 223 case it is called a 20 Pratical

http://www.6mmbr.com/20Caliber.html

Jim

[Brian Pfleuger]

Originally Posted by hickstick_10

wonder how the long the barrel would last on that number?

Peak pressure has a lot to do with barrel life. If it was kept to 58,000psi then the barrel should last as well as any high speed varmint round.

[Sevens]

Oh, I don't know about that. (actually, I'll be honest -- I really don't know crap about that! ) But the old .220 Swift that did a lot of work at or near the 4,000 FPS mark was legendary for burning up barrels. What pressure did that run at?

It just seems to me that there is a reason, especially in this day and age when almost any new cartridge is given a shot (can anyone say .25 NAA?) that they haven't given us a 5,000 FPS cartridge. There must be a solid reason.

Maybe they can't construct a bullet that will handle it?

[49willys]

How about a .204/378 Weatherby?

[Brian Pfleuger]

Originally Posted by Sevens

But the old .220 Swift that did a lot of work at or near the 4,000 FPS mark was legendary for burning up barrels. What pressure did that run at?

The MAP for the 220swift is 62366psi. That extra 4,000+ psi makes a difference in barrel life. Mind you, I'm not saying that the .204-308 would have GREAT barrel life, just no worse than a 22-250 or something similar. Maybe no better than the swift.... I really have no idea.

Bullets can handle the speed just fine once they make it out the barrel, I don't know about all that friction while their still under that kind of acceleration. 30cal Accelerators (55gr 223 bullet in 30cal guns) can be fired in excess of 5300fps in the 300WthbyMag. They are in a plastic sabot though.

[Jim243]

My first reaction is it would be too heavy of a barrel, but them I was thinking why not a 450 Baywolf necked down to 223 now that would be a really smoking AR.

Jim

[49willys]

444 Marlin necked down to .308

[Newton24b]

not everything has to be a complete revision or upheaval of existing technology.

for example the fact that ammunition companies decry my idea of loading a short version of the .410 shotgun round as merely shotcup, and powder in a standard plastic shotshell case or brass case as "lunacy inviting owners of 1900 made .410s to sue for liability if their gun blows up"

or that a certain company makes a revolver that would allow for the reintroduction of the dardick tround in modified form that would allow for very short range use for self defense unlike the other.

the real money is in taking an old idea, that is now considered crap and making it work better then before, or as well or better then the current "real good stuff" on magazine covers.

[javven]

Neck 338 Lapua down to 7mm?

[plainsman456]

Someone should try to make a 300 whelen.

[HiBC]

The more it is a big boiler room necked down to a tiny hole,the closer it gets to being a "destructive device" Things get sudden.I am not really focused on building Mauser sporters right now,but an 8x57 necked up to .338 and Ackley improved might work real well in a standard length mauser box.There are more .338 bullets available.
376 Steyr brass is offered by Hornady,and it's lenghth is appropriate for Mauser Mag boxes.Anything from .416 to .308 would work.
To my way of thinking,the beltless fatter cases are a fine idea,but the standard action lenghth was ignored.The Dakota series,like the ,338 Dakota,make sense to me.
The .220 Swift brass and 6.5 dia might make a nice single shot round.

Look at the PO Ackley "Handbook for Shooters" and I think you will find wildcatters have tried most every combination.Its all fun!!

[SL1]

One of the things that would interest me in a wildcat is a round that has a long-enough neck to make it easy to load a large variety of bullet weights. It seems that most of the newer rounds are designed with a short neck to get maximum powder capacity for maximum velocity. BUT, that maximum velocity is not REALLY that useful in most of the applications that these cartridges are really used for by their owners.

So, when Ruger introduced a new case design that is the same diameter as the belt on the usual belted-magnum cases, but with no belt and more internal capacity, it gave me some hope. Most regular diameter actions can be chambered for that case diameter. What I would like to see are some cases that would essentially duplicate some currently available cartridges in terms of performance, but be more "reloader-friendly" with longer necks, no belts and shoulder angles that aren't too steep for easy feeding.

Of coures, it is HIGHLY unlikely that any commercial company would spend the money to introduce such designs, because the "wow-factor" isn't there to help them overcome the already established cartridges with the same performance. It would be like the current situation with the .243 Winchester and the 6mm Remington (once Remington fixed the twist-rate problem). So, it would be up to wildcatters to produce something that other handloaders would pick-up on and make more widely used. Remember, it is basically the handloaders who have kept the 6mm Remington from disappearing totally.

SL1

[BGutzman]

I thought of many concepts, most aren't able to be massed produced or not able to be done so easily. For example arrows have razors that are pushed out and expanded by the force of impact so why not bullets? Yes there are ways around all the problems but how do you mass produce it? (Is there truly any advantage too it? Im not so sure)

Or how about tungsten carbide jacketed rounds for hunting bear? Good Idea? maybe, maybe not but certainly interesting?

Or how about hollow point rounds where each pedal is on a limited hinge at the base with a plastic band at the tip holding the pedals in place until impact. You would certainly have close to 100% of the rounds expand on impact. Pedal length and angle become a function of design in such a way that expansion is basically predetermined.

Its all fun but not mass produceable, or at least they wont take my word for it being produceable.

[Jim243]

SL1

The wildcaters use 6mm and 20 cal rounds because they are looking for range and speed and the light weight bullets are perfect for these applications. When you get into larger caliber and weight bullets the purpose complete changes to effective rounds for hunting. The larger bullets are harder to control because mother nature (gravity and wind resistance) makes it more difficult to push them at the higher speeds unless you use mag or supper mag loads. To try to compensate for these limitations we have the short mags and super short mags which were a total failure since they shorten barrel life and did not give any exceptional increase in performance.

You have two size actions (short actions and long actions) to get what you want you will need a third size action in rifles, something between a long action and a 50 BMG. Now the mfg would have to offer three type of actions in their line up. Not sure if there would be a market for them or if it would be profitable (that is the driving reason). It would simply be easier just to take the 50 BMG and reduce the caliber and neck down the case, but that creates additional problems with pressure spikes for such a large caliber.

No easy answer to this but I am sure we will see something new out soon.

Jim