Howdy,

Ok, everyone has heard of the 22-250. I was wondering if there was such a thing as the 22-257 Weatherby mag. I think it could get a little faster and flatter shoothing than a 22-250 if it is possible to make. I'm not much of a "Wildcater" or whaterver you guys call yourselfs, i just am kinda curious. So if you have ever heard of one please tell me about it. Thank you very much.

The 7mm necked down to 6mm is the 6mm Mach IV, Ross Seyfried did an article about this one a while back. Speeds high enough to get me started building one. He used military surplus powders for big (40mm big) military cases to get the speeds he wanted (Thunderbird Powders or something like that, sold them). The 22 would require even slower powders, and I'm not sure you would gain anything due to lack of case capacityversus the slow, slow powders. Of course, this is just interested supposition on my part, so perhaps you should build one and share your findings here. - Dan

I think it owuld be hard to find a slow enough powder to work in this, and you would wear out a barrel fairly quickly. Anything is possible, tho'. The 22-6mm Rem (also known by other names) is about the largest case 22 that I know of for regular use. I seem to recall a gent writing up a 22-06 some years back, but there again, overbore quite a bit. - Dan

TERA


That it is the length of the casing 6 mm Math IV

quote:

Originally posted by dan belisle:
I think it owuld be hard to find a slow enough powder to work in this, and you would wear out a barrel fairly quickly. Anything is possible, tho'. The 22-6mm Rem (also known by other names) is about the largest case 22 that I know of for regular use. I seem to recall a gent writing up a 22-06 some years back, but there again, overbore quite a bit. - Dan

The 22-6mm Rem is most commonly known as the 224Clark and is usually only built with a fast
twist for shooting 70-80gr bullets as it is impractically overbore for shooting the lighter bullets.

AllanD

I built a 22-6mm ackley a few years ago and wasnt impressed. 4300 fps was max with a 50 grain pill before i ran into pressures. 4150 fps for the 55s. For a measley 200 fps more than my 220 swift i didnt think it was worth it. I sure wouldnt look very hard at a 22-257 weatherby. You hit the wall so to speak, with any thing bigger than just a 22-243. If you want a real hodrod that will out do any .22 centerfire build a 6mm-06. 55s at 4400 fps and 70 grain pills at 4000 makes for some violent impacts.

i could just loan you my sandblaster pot and 50 # of sand... While it might not erode the throat QUICKER, it would do it more even and with less heat

seriously, this is a barrel burner
jeffe

Hey Dan and guys isn't the 22/6 also where the TTH came from?

Also anyone know if there is any diff and or what it is from the 22/6mm (Clark) and the TTH?

Many thanks

Mark D

quote:

Also anyone know if there is any diff and or what it is from the 22/6mm (Clark) and the TTH?

The TTH comes from the 7X57-257R-6mm necked down to 22. Basically it is the Clark. However the twist is normally much faster than what was used for the Clark allowing much longer bullets.

http://www.ttha.com/224tth.htm

Thx

Mark, The 224 TTH is the 6mm case necked down to .224 without any other changes. ie a 22/6mm

Ken Clark (from California) developed the .224 Clark in 1962, and it is formed by necking down the .257 Roberts case to .224 and then fireforming in an improved chamber with a 30 degree shoulder angle.

Clark used the .257 Roberts case instead of the 6mm case, because his experiments indicated to him that the 257 Roberts case was stronger.

Depending on the batch of brass, the 257 Roberts when necked down to .224 has a case capacity of about 57.0 to 57.3 grains, and when fireformed in the Clark chamber has a capacity of 63.8 to 64.0 grains.(virtually identical capacity to a 22/284)

I built up a rifle chambered for the .224 Clark in 1988 using a Rem 700 SA, and Shilen SS 25.25 inch 1 in 10 twist barrel. It achieved 3930 fps with the 69 grain Sierra and 0.5moa. The Hornady 75 Amax recorded 3,830 fps, and the Sierra 80 grain MK achieved about 3,730 fps, although predictably both bullets did not stabilise.

I loved the rifle and fired about 1600 shots before retiring it, and then had the barrel set back and rechambered to a 22/250AI.

The one one shortcoming of the rifle was my original decision to use a 700 Short action rather than the long action, as the 2.800 magazine length is too short to allow you to chase the lands as the throat erodes, and also the longer heavier 75 and 80 grain bullets had to be seated with the base projecting well below the base of the case neck.

I am currently building another .224 Clark, and will be using a Rem 700 LA, and a Krieger 27 inch 1 in 6.5 twist barrel, which hopefully will stabilise the 100 & 107 grain Wildcat bullets. Recent evidence from other users suggests the 90 grain Sierra won't be an option as it comes apart at velocities of around 3,200 and above. Regards, Brian.

Hey Brian-many thanks, great info. I do a fair bit of cattin and am giving some thought to going with a big case 22 with a quick twist in it.

A couple of more questions if you don't mind.

So it would appear to me that the TTH would be a bit slower (6 grains less powder), how much slower would you think?

Also it would appear that the TTH may be a bit easier to form brass and go shoot..correct?

And lastly as for price of dies, I've been burned a time or two on the price of these dogs. As for your knowledge is either of the dies for these a lot more $ than the other or not?

Many thanks again for your help.

Mark D

Oh and the action I am looking into doing it on is a long action.

Mark D

Mark, I have observed that the majority of 22/6mm users with 24 - 26 inch barrels seem to achieve between 3,550 - 3,650 with the 75 Amax, which is about 150 - 200 fps less than the .224 Clark.

The .224 Clark will probably show an even greater advantage over the 22/6mm if you use bullets in the 85 - 100 grain range.

Yes! The 22/6mm (TTh) should be the easiest to form, as it simply a matter of necking down a 6mm case to 224, and shooting, as there is no need to fireform cases.

Some people may decide to neck down Lapua 7x57mm brass to .224 as they believe it will give them an advantage in accuracy. Obviously if you do this, you will need form dies, and also to neck turn the cases to get the correct neck thickness.

I just checked the Redding and RCBS websites, and found that both are listed under the "Custom Banner", and hence are more expensive. Redding price list shows $138.00 for 2 die set, and $216.00 for 3 die set (inc neck die). However, the 22/6mm is a fairly popular wildcat, so I would be surprised if there isn't a cheaper source of dies.

Personally I believe that the 22/6mm is the better option if you are intending to use bullets in the 70 - 80 grain range, and to seriously consider the .224 Clark if you want to use bullets in the 85 - 107 grain range.
Regards, Brian.

Thanks Brian it gives me something to think about. I e-mailed Pac Nor today to see if they have a reamer for the TTH.

Is the TTH and the 22/6mm the exact same thing?

If I did it I would be for shooting the 69-75 range for the most part.

If I want a bit heavier slugs I will just use my 6/06.

Any idea of what those fellas like to burn behind those slugs for powder?

Many thanks for your time

Mark D

In my younger days I fired a 60 grain 224 diameter bullet from a 300 H&H case. It clocked over 4,500'/sec.....but badly heated the barrel in just one shot.

After studying the limiting returns of marginally better cartridges I decided I needed to get over 5,000'/sec to keep shooting it.

THERE'S A REASON NO FACTORY MAKES IT.

Mark, I have visited the TTH website a few times, and from my interpretation of their description of the .224TTH, it is the same as the 22/6mm.

Ken Clark was emphatic about using ball powders to prolong barrel life in the .224 Clark, so I intend to use up my supply of H870.

It takes about 61.0 grains/H870 to fill the .224 Clark case to the base of the neck, and I estimate that a load of about 57.0/H870 will be maximum with the 100 grain Wildcat ULD.

Oz is a windy place, and I learnt 30 years ago, that using the heavy high BC bullets to reduce the allowance for wind enabled me to make more hits past 300 yards than when using light bullets at over 4,000 fps. Good luck on your project. Brian.