I am looking for firsthand experience, Recommendations on who is very good at Reboring a barrel. Would prefer recent experience. Seems like several of the very good ones have gotten out of the business. This is a centerfire rifle by the way. And not black powder.

What caliber are you going from and to? What is the muzzle OD.
Often reboring is not possible; barrel walls get too thin.
I always rebarrel unless there is something special about the barrel like an integral rib, octagon, etc.

Depending on what you want done:

http://www.35caliber.com/

It is an original Oberdorf sporter with a full octagon and solid rib. It is a 9 mm Mauser I want to go to 9.5 mm Mauser.

Call him.

The 9.5x57 is not a Mauser cartridge, it is a Steyr/Mannlicher thing, and the case head is smaller, at .468 nominal OD. So I would use standard .473 brass, and get custom dies so you don't get case bulges.
The 9.5x60 Mauser was made for Turkey and is Black powder.
Jesse will tell you if your muzzle OD is enough for him to rebore.
.375x57; good round. Why not go ahead and make a 375-06? Whelen like.

Actually, while the 9,5x57 was a 1910 Mannlicher-Schoenauer developed cartridge, it used the "standard" 11,95mm (.470-.473") head diameter of the Mauser family rather than the smaller 11,85mm (.466") diameter of the 8x56 (1908) and 9x56 (1905) M-S rounds. The 9,5x57 is also identical to the .375 2-1/4" Nitro Rimless used by the British. Loading dies labeled for either 9,5x57 M-S or .375 Nitro Rimless are correctly proportioned for the larger diameter; and from my experience, one can form cases from 8x57 or 30-'06 very easily.

This rather odd fact is shown in several references including Dixon's "European Sporting Cartridges" vol 1, and Hoyem's "History and Development of Small Arms Ammunition" vol 3.

I am also a fan of Jesse's reboring work at 35caliber.com as mentioned above.

All the data I found said it was the smaller size.....
Just looked in my Cartridges of the World; .473.
Go with what Steve said.

interesting info. I have a 9x57 half round with a poor bore. was wondering if 0.5mm will clean it up.

I have a set of the .375 2 1/2” dies, so that was what my intent was.

1/2mm is roughly.020”. Should be more than enough to get the bore back into shooting shape.

I have one done by Jesse, just what you have, 9 to 9.5x57. It worked just fine to clean up the old bore.

JES recently bored a 243 to 338 in a Ruger #1; shoots great and survived a trip to Namibia. A 338 Win Mag with 250 Nosler Parts is hard to beat for plains game, even the small stuff. Size does make a difference, at least that's what my ex-wife used to tell me.

Thanks Guys. I left a message with Jes this afternoon and waiting for the reply. Glad to see that he’s already done what I’m looking for.

quote:

Originally posted by OSA:
I have a set of the .375 2 1/2” dies, so that was what my intent was.

I hope that was a typo and you meant .375 2-1/4" - unless by .375 2-1/2" you meant 375 Whelen, which is also a great round.

To add to the discussion about 9.5 cartridges, I have in my collection a Haenel built rifle, chambered in the long obsolete "Kal 9.4mm" which utilized a 56mm case. (Case 393 if you want to look in your DWM book) This cartridge predates Steyr's MS by almost 20 years.

It is often a confusing journey to unwind the origin.

From noted historian Axel Eichendorf:
"This 1893 case is so close in appearance to the 1910 9.5x57 M-Sch that just a slight change in shoulder angle or diameter makes it different, well inside the 1890s – WW1 case and chamber tolerances. The Steyr and Roth factories in 1910 may have merely copied the forgotten older DWM case when they offered their own 9.5x57. At least, the 1910 M-S case has not the 11.85 mm base of the 8x56 and 9x56 M-S cases, but the 11.95 mm base of the 8, 9, 9.3x57 Mauser cases, just like the 9.4x56 DWM. Contrary to popular belief the 9.5x57 M-Sch is not merely a 9.3x57 opened up to take .375" bullets, but a somewhat "improved" number: the length to shoulder is .62 mm = .024" longer and the diameter at shoulder .45 mm = .018" larger. This amounts to some headspace if you merely neck up Mauser brass and try to use it in a 9.5x57 M-S chamber."

Yes, typo.