6mm WildCat at 4000 fps with 115's

[lynn]

A

 

[2644ever]

Ask JGS, they could probably tell you more about the 6mm SOB,Superbly Over Bore) or 6mm-7STW, a wildcat from 1993 or 1994 that was first chambered in a 30" Douglas on a Ruger#1 receiver and would use around 95 grains of 8700...

 

[dsbw]

My friend,chrisnam is his forum name) would be able to advise. He's planning an EOB,Extreme Overbore) 6mm.

 

[rcw3]

Do you really think with a case that can drive them 4000 fps:

1. The barrel will last more than 500 rounds?
2. The bullets will all stay together?
3. You will actually find great accuracy?

I suspect the answer to all questions is probably not.

Best case, by the time you might actually get an accurate load worked up, your barrel will probably be half shot out.

Just some opinions FWIW.

Robert Whitley

 

[Cheechako]

Lynn

I thought everyone knew about the Eargesplittenloudenboomer. It's a real cartridge.

Ray

 

[rcw3]

Lynn

I thought everyone knew about the Eargesplittenloudenboomer. It's a real cartridge.

Ray

I don't know Ray, the case capacity of that seems a little small for the bore size - what do you think?

All kidding aside, that case has so much capacity you could probably burn charcoal for powder and still get 1000 fps with it.

Robert Whitley

 

[Cheechako]

Robert

The Eargesplittenloundenboomer was chambered in a rifle by P.O. Ackley back in 1960s for Guns & Ammo magazine to see exactly how fast a 22 caliber bullet could be shot out of a conventional rifle. Before shipping the rifle to Calif, Ackley did a few preliminary tests with 50 grain bullets and only got up to about 5000 fps.

I have no idea what they used for powder or what velocities they acheived. Maybe someone here knows the results of the tests?

Think you could get one to work in an AR?

OK Lynn - go for it.

Ray

 

[DTubb]

Lynn,
Pretty shortly I will have a case which,when necked down to 6mm) will certainly make the 115 go over 3700 fps,a similar case with approx 10 grains less water capacity already drives the 6mm 115 at 3600 fps).
Dtubb

 

[Asa_Yam]

I thought everyone knew about the Eargesplittenloudenboomer. It's a real cartridge.

Ray,

The .17-50 is a real cartridge too. I've seen more than a few of 'em at various gun shows.

 

[okie]

I've always wondered if you necked a 7mm rem ultra mag down to 6.5, how fast it would push a 142 mk? probably wouldn't give best accuracy however. My smith has a 6.5\7mm win short mag, it is less than impressive in speed and accuracy.

 

[Spotcheck_Billy]

Robert

The Eargesplittenloundenboomer was chambered in a rifle by P.O. Ackley back in 1960s for Guns & Ammo magazine to see exactly how fast a 22 caliber bullet could be shot out of a conventional rifle. Before shipping the rifle to Calif, Ackley did a few preliminary tests with 50 grain bullets and only got up to about 5000 fps.

I have no idea what they used for powder or what velocities they acheived. Maybe someone here knows the results of the tests?

Think you could get one to work in an AR?

OK Lynn - go for it.

Ray

Ray,

Ackley necked a .378 Weatherby case down to .224 with a 40 degree shoulder for that experiment. He reported driving a 50gr. bullet to 4600fs with 105gr. of H570 before sending the rifle off to Bob Hutton. I've got no figures on what Mr. Hutton was able to get out of it. I wonder if he was able to find bullets that would consistantly hold up to those velocities back then. I suspect that Ackley was using his own lathe-turned bullets during his testing.

Regards,
Al

 

[rangerruck]

I recently read an article, about a dude who got some spectacular results taking a 300wsm, and necking it down to 7mm. I think he was using this as a 1000 yd shooter, and shot a very nice record with it. I would say, this sounds great for about a 140 grain 6.5.

 

[chrisj]

How about running a 270 WSM case into a 243 WSSM die to neck it down.They already have a 6.5 WSM. RANDY

I shoot a 240 Weatherby Magnum that shoots extremely flat and has enough energy to take deer sized animals past 500 yards. A previous 6mm-06 Ackley which was even faster worked well too. A 6mm-284 should work about the same. If you only shoot 100 or so rounds a year...the bbl should last a decade for hunting purposes.

Chris

 

[mysticplayer]

lynn, my guess is that powder will be your limiting factor. The slowest stuff I can get is H50BMG. Maybe some of the 20mm vulcan pull down is slower?????

I would hazard that the 6 STW or a 6-300Dakota is about as large a case as you can go. The 6-338RUM would be the next size up but unless you can make wet sawdust work, I just don't think powders are slow enough.

Would be interesting to see if the bullet stays together and shoots accurately though.

For moderate LR hunting, I use a 7RM with 162gr Amax. With a muzzle brake, I can spot my own hits from 300yds out to as far I can range with my Leica 800. Might be a little less problematic then your wildcat.

But then, when was wildcatting ever based on simple...If you build it, let us know how it turns out.

Jerry

 

[joesr]

I'm working on a new cartridge that will propel the 115 at over 3500 fps.

How much over I don't know, but velocities of 3700 to 3800 are not out of the question.

I'm still in the design phase of the project and should have reamer drawings back in a day or two.

The biggest question is what barrel twist to use.

I do know that I'm going to follow the same plan as I did for the 6CM and hopefully barrel life will be 2000 rounds. But I don't know.

I will keep this board up to date as progress continues.

I'm very excited about this new cartridge and in the coming months I'll update with all progress.

This one may take more testing than the 6CM.

Joe Hendricks

 

[jimm]

Lynn,
Pretty shortly I will have a case which,when necked down to 6mm) will certainly make the 115 go over 3700 fps,a similar case with approx 10 grains less water capacity already drives the 6mm 115 at 3600 fps).
Dtubb

That sounds marvelous What about the 117 DTACS ? Oh yeah , what about the boron nitride coated DTACS

Are you going to tell any more about this case here David or is the timing off ?

thanks , Jim Brown

 

[robbor]

I want to say that about 2 years ago Redding already had made some custom 6-300 rum dies. But why would you wany a 6mm at 4000 fps when in the ackley book they show a 17-50bmg .

 

[halfdan]

Maybe 25 Banshiee necked down to 6mm?

 

[ConnorExum]

From what I understand the absolute maximum velocity for solid powder propellant is something like 11,000-12,000fps tops... You just cannot get enough gas pressure or expansion of the gase using conventional solid propellants beyond this threshold. However, with liquid propellants you can get 30,000fps I read. So perhaps we need to think of using liquid hydrogen and oxygen?

 

[nickthe]

i am of the understanding that 6000 fps is the fastest in theory a bullet can be propelled from burning powder and compressing gas can travel any thing faster would have to be electro magnet rail gun