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Clarkm Offline OP
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Has anyone done this?
I am shooting deer out to 629 yards and I like more power. I would like to go to 25-06, but I have 257R and 250S reamers as well.

I can change the mag length and the ejector length.

The feeding is what I am worried about.


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Bobin mentioned something about feeding problems when going this route.


Originally Posted by raybass
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style.
Originally Posted by Pharmseller
You want to see an animal drop right now? Shoot him in the ear hole.

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Clarkm Offline OP
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That is what got me worried. I looked at the lips and they are different, but not different like I thought would cause his symptoms.


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Will it feed an empty 06 case without anything odd happening?

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I put a dummy 6.5-06 cartridge in it and it fed just fine.

I can't get it out:(

I have to do something.

My father called this work on gun development for the gov "unscheduled disassembly".


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Clark the rails are different on a pre 64 M70 308. The cartridge is short,and the magazine is blocked for the short case. The rails are tuned to the short magazine and cartridge.

When you go to a 30/06 cartridge, you have to remove the short box and replace it with a 30/06 box and follower. But the rails remain the same and the longer case will pop free of the rails "sooner" than they will on are 64 action set up for a 270 or 30/06.

You might think there is not much difference by looking at it, but it's there and and you don't get a feel for these things by looking. You gotta "do" and I "did" and would not do it again.

The case will be a lot further back as it jumps free of the rails. If you re lucky the rim will jump under the extractor for you way back there. And hopefully the case will be aligned for easy passage into the chamber. Personally in going from 308 to 270 I did not like the arrangement at all and would not do it again. But that's your call.

I don't know a way to add metal and regrind rails to better accommodate the longer case. Seems like a lot of work. You will see if you do it that the bolt is only about half way forward when that 25/06 will jump up off the rails into the raceway. Hopefully the rim will be grabbed by the extractor and be properly aligned for passage into the chamber but it looks and feel 'sloppy" since the front of the cartridge may or may not be aligned for passage into the chamber.


If Winchester wanted the longer case popping up that far back they would have arranged that in the rails of the 30/06 based cases way back in 1937.Pre 64 rails are cartridge specific, and given the function history of the pre 64 M70 (pretty much perfection), I am not going to second guess the pre 64 engineers. When it comes to bolt cycling they got it right the first time, If they wanted 308 rails for 30/06 cartridges they would have set them up that way in the first place. They didn't.

I am a function Nazi and did not like the arrangement. It was junk.

Personally if it were mine I'd rebarrel to 243, get a fast twist tube for it to shoot the heavy 6mm bullets and forget the 25/06.

But that's OK. There are plenty of guys who thought they could second guess Winchester engineers and there are plenty of screwed up pre 64 actions out there. Might as well add one more... smile It's Mickey Mouse.

You can do it if you like. Good luck.


If you still have the 308 box in the rifle how did you test the 6.5/06 to know that it "fed just fine"? A loaded round won't fit a 308 box(?)

And what is stuck that you can't get out?

Last edited by BobinNH; 06/16/16.



The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Bob,or anyone else, would a 257 Roberts "fit" in the 308 designed action or is the factory setup for them slightly different? No doubt a 260 or 7-08 would work well.

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How about taking Bobs advise and just pickup another gun in
a different cartridge. So happens I'm aware of a pre 64
with a 6.5x300 Wby barrel owned by a recently deceased
Williamsport shooter/hunter who had quite a collection.
Why booger up a fine gun when other options exist.

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Pat I think so. Not sure. For some reason I think the mag box parts for the 257 was bit different.

The 270 I had "worked" on that 308 action but it was obvious it wasn't right. Some may not be bothered by it but there's no guarantee it will work for someone else on another action,so I can't recommend it.




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Both the 257 and 308 (along with the 243 and 358) are in cartridge group IV and share the same action components....


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I remembered I had some empty Roberts cases so just tried feeding them through the action of my 308 fwt. Empty they fed fine so I suspect that loaded ones would also work.
Not sure where that gets the original poster, but interesting in any case.

Last edited by patbrennan; 06/16/16.
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Clarkm Offline OP
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[Linked Image]

This afternoon I drove to the pawn shop and bought another M70.
Another 1953, but this one is a long action.


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Nice. I think you will be happier.




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Looking at the price tag you didn't get hurt either!

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Dang nice rifle there


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1. The altitude above you
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Originally Posted by Clarkm
[Linked Image]

This afternoon I drove to the pawn shop and bought another M70.
Another 1953, but this one is a long action.



Oh, you snagged that SOB. Did you try to talk them down on the price. I would have, even though it was dirt cheap as is wink laugh . You did good!!


Originally Posted by raybass
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style.
Originally Posted by Pharmseller
You want to see an animal drop right now? Shoot him in the ear hole.

BSA MAGA
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Clarkm Offline OP
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[Linked Image]

Left to right:
1953 M70 30-06
1953 M70 308
1956 M70 30-06

[Linked Image]

Parts:
1953 M70 30-06
1953 M70 308


What does it all mean?
No the feed lips on 30-06 and 308 are the same.
But the ejector, magazine, magazine follower, magazine spring, and that thingy attached to the extractor collar, are different.


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Cool! Then build yours on the 308 and let us know how it turns out.

I didn't like mine and thought it worked lousy in 270......but maybe yours will work better.





The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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I tried feeding empty 06 cases in my 308 and did notice the cases popping up to the extractor as Bob said. Funny in that the ones on the right side of the mag worked okay, the ones on the left side sometimes did not catch the extractor.

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Originally Posted by patbrennan
I tried feeding empty 06 cases in my 308 and did notice the cases popping up to the extractor as Bob said. Funny in that the ones on the right side of the mag worked okay, the ones on the left side sometimes did not catch the extractor.


Pat you got it....I can't recall left or right side....too many years ago, but the case would fly off the rails up into the raceway in what I would describe as "too early", kind of hard to describe, but I had the impression that that it was just dumb luck that the extractor was able to grab the case rim at all. That was if I moved the bolt fast....if I moved it slow the effect was even more exaggerated.

The only thing I can think of is that the 308 case approaches the feed ramp at a slightly different angle than a 30/06 based case, because it's shorter (?)

I don't know....I'm no gunsmith. All I know is what I saw and after umpteen pre 64 M70's chambered 270/30-06 I knew something was not right.


But Clark does his own gunsmithing so he can barrel it up the way he wants and play with it. Maybe it will work for him.

Last edited by BobinNH; 07/08/16.



The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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