I recenly found this size caliber on MGM web sight.
I am told it would have less recoil than a 30-30.
Has any one here ever herd of this caliber ?
And Where can I find reload data for it ?
I was also told to just neck down the 30-30 to 270,
And crimp using 270 dies.

The 7-30 Waters would be a better choice IMO. Greater choice of bullets and the Waters case is slightly improved from the parent 30-30. There is only a .007" difference between the .270 and 7mm so that is negligible. If I were to go smaller than 7mm, it would be a 6.5/30-30 Impvoved, again due to a better bullet variety. But if you really like the .270, by all means.

The 6.8 SPC would fall into the 270/30-30 catagory. The SPC case was designed around the old 30 Remington which was a rimless version of the 30-30.

You would have to check cartridge deminsions to see if they were the same, but it sounds to me like the 270/30-30 is a rimmed version of the 6.8 SPC. Call MGM and ask.

I don’t think the 6.8 would have the case capacity the 7-30 Waters does. I think am “improved” version would be marvelous… but I think a 120gr 7mm would be better as well. Just my .02…

I have a 6.8 “Long” in a Contender Carbine and if I had to do it again I would get a 7-30 Improved.

The 6.8 and the 7-30 have the same base diameter .421-.419"

Shoulder diameter is the same .401"-.399"

OAL is 1.686" for the SPC and 2.040" for the 7-30

The 6.8 is loaded to 53,000 psi, the 7-30 is loaded to 40,000 CUP. There is now real good way to compair PSI and CUP, but the 6.8 is loaded to a higher pressure than the 7-30. Compairing a bullet of equal weight like the 130gr the 6.8 tops out at 2,300 fps and the 7-30 tops out at 2,500 fps. Going by data and drawings in the laod manuals.

TC whats a 6.8 "long"?

I bought a 25x30-30 ackley improved from MGM, What a zinger. She's been a real antelope killer. I agree with the 7x30 waters, or even the 30-30 ack. Both are great for medium game.

Lars

I found load data the other day for the 22x30-30AI and that sucker is hot it runs a 50gr bullet to 4000fps and the 55 to 3800fps.

The 7x30 waters just keeps coming up.
What makes it IMPROVED ?
It Appears to me That the 270x30-30and the 7x30 are almost the same Animal. Both seem to use the 30-30 as a base cartridge.
And both are basicly 270 Dia.
TCMAN What do you meen buy a "Improved" version would be
marverlous ?
Keep in mind I am looking for something low recoil, And accurate

A 6.8 Long is/was just a Coyote Guns wildcat. It lengthened the case a ¼ in and keep the same shoulder. Basically, it is an AI without a 40% angle. The best part is I use my RCBS 6.8 SPC dies. I also make my brass from 30 Rem brass so I don’t have to fireform. It adds 125fps for a 14in barrel and almost 250fps for my 23in barrel.

I don’t know… performance wise the 6.8 SPC and 7-30 Waters are pretty close. With what I have seen of the wildcats off the 30-30 platform, I would say it has move potential than that of its 6.8 SPC brethren. Basically, there isn’t enough difference for the custom shops to buy new reamers and particularly sense 30-30 brass is as abundant as it is.

Mr. Mike, I love the 7-30 Waters. However when I bought my custom I went with the 30 GNR (30-30 AI) because I could buy inexpensive factory 30-30 ammo to shoot for fireforming. If you have your heart set on a 270, please by all means pursue your love, I just wanted to throw that thought out there. In addition, the biggest difference I seen in the 7-30 and the 270-30 would be what grain bullet you want to shoot.

R/

Duane

When the Waters case is formed the shoulder is pushed forward giving more powder capacity, not just a necked down 30-30 case. The 30-30 has a long neck and needs improvement to get the most out of it. The Waters is low recoil, at least to me, and you can load it down if you want. The 270x30-30 may do you just fine, there just aren't as many bullet options as with the 7mm or 6.5mm, that's all I'm sayin'.

"6mm Nemesis"

Boys:

Imagine The Illustrious Old .30 Remington Case Necked-Down To .244 And Trimmed To Seat The Long 100-120 Gr. FMJBT High B.C. Bullets To Be Used As The Pilot-Cartridge(The Original Intent For The 6.8 SPC)For Military Assault-Rifle Prototypes.You'd Have An Exceptionally Flat-Shooting Energy-Retaining "Keyholing" Bullet Which Would Fragmentize Upon Deep-Penetration After Cutting Through Multi-Layered Kevlar. Let's Christen It : > > > > > > > "6MM NEMESIS"

Well I'm not dead set on the 270x30, It sounds like a better chioce than the 6.8
It realy seems that the 7-30 is a very populer round, And it must work for it to be so.
There again, I cant find any Data for the 270-30, or any one using it.

TCMan I got to thinking about the 6.8 "long" last night and then remebered you have a 270 barrel. I figured you were refering to that.

That would be a "LONG" 6.8 for sure! LOL Or maybe we should call that a 6.8 Super Magnum.

Left to right…

270 Win, 30 GNR, and 6.8 SPC Long.

According to Mike Bellm the 270X30/30 is just a RIMMED version of the 6.8 SPC. It is primarily for Encore or Conder shooters that prefer a rimmed case.

Mike, sorry for not answering your question and THANK YOUR S4S4U!


Basically, that is correct. As Tig pointed out, there is a couple of thousands difference in between the two rounds. If you call MGM up and ask them if they can rechamber a 6.8 to a 270-30 they will strongly recommend you find another platform because the 30 Rem case is a little wider. I know I tried… LOL Because it is quite a bit longer, I think the 30 Rem case has more potential than the 6.8 SPC case, but again, why not go ahead and use the 30-30 based wildcats out there and save a lot of headaches.

The 270 X 30 would be more work concerning fireforming, dies and handloading, but I think it would be an awesome round and definitely worth the trouble.

Mike S.

The "Improved" term comes from an old gunsmith named P.O. Ackley. He would cut a new reamer for an existing chamber with new dimensions. His dimensions would move the shoulder location toward the case mouth (bya couple thousandths), reduce the body taper (making the case walls more parallel to each others) and increase the shoulder angle. This created more powder capacity and decreased bolt thrust allowing you to run things a bit warmer. He called these rounds "Ackley Improved".

Here's a comparison of a .250 Savage next to a .250 Savage Ackley Improved for comparison.



BTW...as for the .270/30-30 compared to the 7-30 Waters...go with the Waters. Better bullets and a MUCH better selection of dies are available.

Thank You to every one who replied
The info as always is a big help !