Swiss Schmidt Rubin 7.5 straight pull bolt action.

[0007]

K-31's

Just re-read my earlier post. What I meant to say was that I was going to have both of mine re-chambered to 7.62X51. "K-31" over on the AW board threatened to have me booted out of the '31 owners club over that one, but I figured that doing this will sure make finding(and buying)ammo a whole lot easier. He also said that it's OK to do this on the K-31, but NOT, REPEAT, NOT, on the original Scmidt-Rubin. Can't wait to try them after the job is done. For those really interested in the Swiss rifles, K-31 moderates a forum, Swiss rifles.com. All sorts of good info there.

 

[Handy]

How do you rechamber to the shorter .308 case?

 

[Tamara]

Handy,

I'm no gunsmith, but I'm guessing it would just be a matter of setting the barrel back and recutting the chamber.

 

[Handy]

Ah!

No gunsmith either. I didn't know you could just screw the barrel in a couple more milimeters. That sounds alot smarter than my old chamber insert idea (which likely wouldn't work any way, the two cases too close in size).

If it's that simple, I would do it in a heartbeat. I haven't heard anything that suggests that there are any 7.5 advantages over good ol' cheap .308.

I can understand the collector wincing, but an $88 rifle can't be that much of a collectors item.

Anybody else have an idea if this is do-able?

 

[Tamara]

Handy,

I didn't know you could just screw the barrel in a couple more milimeters.

The trick, of course, is how much room is there on the barrel shank? This would determine cost more than feasibility, as some milling operations on the barrel shank could always provide more room to play with...

(Again, this is all from fuzzy recollections of conversations with folks who do this kind of thing for a living. ... I wonder if my .300 Whisper Turk is done yet, durn it! )

 

[Art Eatman]

The barrel has to be set back by full turns, if you have any sort of fixed sights, or don't want to drill and tap new holes for other sights. You can cut additional threads with a lathe, as necessary. The back face is turned off on the lathe, and then the new chamber is reamed.

Proper equipment and a little practice, and it's an everyday sort of deal.

Art

 

[k31]

Well, Art, the part that's not an "every day deal" is actually removing the barrel. I'm a machinist as well as a smith, and I can tell you that its anything but easy.
Once removed, however, you can cut and rechamber for .308. I'll never understand why anyone would want to do it, but the k31 makes an amazing .308.

Consider that the Schmidt Rubin series/types were designed around a cartridge. A specific cartridge that works with the deisgn, barrel, twist and length. I have a good number of k11s, 1911s, k31s, PE57s, AMTs and, of course, the venerable zfk3155 Sniper Rifle.
My specialty for the last 40 years or so has been load development for all of the Swiss rifles beginning with the 1911. My logbooks are filled with data. I also have a factory 1911 in .308. I developed a special load that makes it, like it's .308 Swiss brothers, a moa rifle.
Lots of years. Lots of powder and lots of projectiles.
The 7.5Swiss/k31 combination outshoots any military issue rifle I've ever had in my arsenal. Its the only cartridge/rifle combination in the world that was developed one for the other.

Oddly enough, the factory offered the k31 in 7.5 Swiss, .308, 30-06 and 300 Winchester magnum back in the 60s. That tells you the the receiver will handle those pressures.

Load safely and good shooting.

k31

 

[Tamara]

k31,

I have a good number of k11s, 1911s, k31s, PE57s, AMTs and, of course, the venerable zfk3155 Sniper Rifle.

...and I hate you for it.

Nothing personal, you lucky so-and-so.

 

[Handy]

A specific cartridge that works with the deisgn, barrel, twist and length.

Is this to imply that the rifling and barrel length would be inappropriate for .308? What is the twist rate of a K31?

I can think of lots of reasons to convert an inexpensive rifle to shoot a different accurate, powerful and plentiful cartridge.

 

[0007]

K-31

Admit it, you just hate the idea of some evil-doer with "re-designs" on your Swiss rifles... Good to see that you got my post on the other board and dropped over for a visit.

 

[k31]

It's 1 in 11. There's nothing at all wrong with the rate of twist where the .308 is concerned. You'll just have to find an appropriate load.
Let me know what load works for you after the conversion.
etp, I know a little lady who might chastise you for messin' with the old man! heh.................

k31

 

[0007]

rechambering Schmidt-Rubin

Handy et al - The way I make a chamber shorter is to throw money at my 'smith until he says"It's finished."

 

[Tamara]

Well, the main reason I don't convert my 96/11 is that I'm already $200 bucks or so into the rifle. Were I to convert it to .308, I may as well just have bought an M77, M700 or Model 70 in .308 in the first place, from a dollar standpoint... But, you know, whatever floats your boat. Some folks like leaving the old warhorses intact as the pieces of history they are; some like re-barelling, re-stocking, scoping and whatnot...

Besides, the market is all ate up with relatively cheap Swiss and Portugee 7.5 at the moment...