Recently acquired 'For Market Drilling'

[Cthraen]

Drilling 12x12 over 7.92x57 JR


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Now to create 8mm .318 ammo. Any info appreciated.


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[Cthraen]

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Additional info, very curious.

[mike ford]

Cthraen,
I remember seeing this drilling in another forum, where I suggested the Repair Proof might indicate it had been rechambered to 2 3/4"(70mm) shotshell length. Since you reported finding no "70" stamp and that the chambers measure 2 5/8". I am at a loss to see what work required reproof, since installation of scope mounts typically did not (more about scope mounts later). Sellier and Bellot recently had 8x57IR ammo for sale, you might check with dealers that stock S&B ammo, such as Midway, Buffalo Arms, Graf and Sons, and others. It might be possible to use .323" bullets without significant increase in pressure. If you fire a cartridge in your chamber and do not resize the case, whatever diameter bullet that will easily slip into the case neck (.318", .321", or .323") can be used in the rifle. Failing this, .321" or .323" cup and core bullets (not partition or monolithic) can be sized to .318". The dealers mentioned above often have .318" for sale also. With regard to the scope mount bases on your rifle, other members with the same or similar type dovetail bases have been able to easily modify American rings to fit. Mounting a scope will greatly enhance the usefulness of your drilling. Installing a small caliber insert barrel (einsteklauf or EL) would also enhance it, but a scope is more important.
Mike

[Cthraen]

Mike, thanks. Yes I recall your very useful reply over on the DGun forum. As to chamber length my measurement is not very precise as I do not have a commercial gauge. I will check it again. Thank you for your assistance.

[Leatherman]

The style of scope mounts on your drilling can be mounted with either Talley rings or by modifying Ruger rings. You need to measure the width of the bases in mm. Then find the Talley rings that match best. The Ruger rings will need the small centering lug filed off the bottom and then most likely will need some file or mill work to the groove on the Ruger scope base to center the base on the rifles mount. I like and use the Talley mounts. They can be bought as a standard mount or a quick disconnect. Be sure to mount the rings on the scope so both are against the forward lugs on the rifles mounts so they don’t move on recoil. Original quick disconnect mounts are almost impossible to find and are made for the smaller tube German scopes of the period both are very expensive . I also like the lower power Weaver steel scopes of the 50’s. They look nice on the German rifles , are usually inexpensive at gun shows, ( expensive on EBay) and have good eye relief which you need on most German rifles. You even can find these scopes with the Post style reticle. Only down side to the Weaver scopes is that the plastic seals that hold the lenses can dry out and crack on recoil but can be rebuilt with new seals.

[Cthraen]

Acquired components to get her shooting again. Brass from Buffalo Arms, 0.318 bullets, 139g from. Load from a 1947 Lyman manual using 4198 powder.

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