If a person had a custom rifle built in 10.75x68 and brass became unavailable, what options would there be to keep the gun useable?

I have read through old posts and from what I read the 10.75X68 case can not be "made" or converted from any other case. Is that correct?

The only other option that I can think of would be to rechamber it to 425 Express.

With custom quarter rib & sights would not want to rebarrel to a different Cal and wouldn't want to rebore to a larger bore.

Converting to 404 Jeffery would not be practical as that would require different bottom metal.

So would the only option would be rechamber to the 425 Express?

I don't have a 10.75x68, it's just on the short list for the cal on a custom to be built. The possible lack of available brass
if Horneber stops making it is a concern.

I was wondering about options.

Allen

Honestly, how much brass do you need to keep a rifle running? Buy x100 Horneber and don't load it to the hilt and it'll last a long time.

Bertram isn't about to stop making it soon ... at traditional velocities it should be good and will keep a rifle shooting.

Or ... turn belts off 375H&H and form from there but by golly it'd be a lot of work!
Cheers...
Con

quote:

Originally posted by Con:
Honestly, how much brass do you need to keep a rifle running? Buy x100 Horneber and don't load it to the hilt and it'll last a long time.

Bertram isn't about to stop making it soon ... at traditional velocities it should be good and will keep a rifle shooting.

Or ... turn belts off 375H&H and form from there but by golly it'd be a lot of work!
Cheers...
Con

Its a bit more than turning belts off, you'd need to reduce the solid web to about .495" but then taper the cut out to meet the H&H diameter just before the web ran out (I know what I mean ) & then swage it down from there. Not sure what stresses this would impart to the brass. It would probably be easier to use one of the basic cases or 458 Lott brass but the 375 H&H might be cheaper. I'm not sure what the talk is regarding Hornebers plans for this calibre but there seems to be enough concern on various forums to ensure they'll want to make it for a bit yet. I guess the best way is for all concerned to order from Horneber, it a round which seems to be staging a gentle comeback so lets hope, I've a mate who shoots one & currently he's reloading berdan primed S&B brass but he has made an enquiry to Hornber about this brass.
Steve

I'm just wondering about the worse case scenario, down the road a few years if brass was no longer available.

I looked up the case drawings of the 10.75x68 and the 9.3x64.

The 10.75x68 has a rim dia. of .495 and base of .495 and the 9.3x64 has a rim of .496 and base of .507.

Would reforming this be doable if 10.75x68 brass became.
unavailable?

Allen

I've read before that it is doable & the 4mm short on the neck is not a big deal with the 10,75 neck as long as it is, short term anyways. Not done it so hearsay only.
Steve

You can always use 9,3x63 brass and convert it to 10,75x68 as they are based on the same case

But on the other hand, I only knew about 3 9,3x63 rifles in existence...

My, boha's and one sold at Holt's two years ago

I have a lathe, and could run lower pressure loads, if these rifles become cheap!

In Pierre van der Walt's book: "International Big Bore Cartridge Load Data Collection", page 72 it states the cartridge can ba made from .416 Remington brass by:

removing the belt (turn it off) and reducing the rim diameter to 0.4949 ins.

Then, deepen the extractor groove to 0.417 ins and trim the cases to 2.718 ins.

Anneal the case from the shoulders up and then resize in 10.75 dies.

Then, trim to final length, champfer and de-burr.


It also states that it is possible to resize basic 9.3x64 Brenneke brass, those exceeding 2.68 ins in length, in a 20.75x68 resizing die and then fire form.

I have had several old Mauser 10.75x68s converted to a 404 Jefferys without taking a turn off the barrel, it's very close but doable without requiring different bottom metal. You can open up the existing bottom metal but it will only take 3 down...These old guns are very light in weight and have a lot of drop, and I would recommend only using something close to the original loading at 2150 FPS from a recoil standpoint.

You can in some instances cut back a few threads and rechamber the rifle to other cartridges, even with a quarter rib as cutting the quarter rib back is no problem. The main problem is the length of base to shoulder and not many calibers will clean up that shoulder...

Got 6 bxs of Bertram, 4 of them for less than $25/bx couple of weeks ago from Midway. One bx of loaded RWS and another two boxes of Kynock. Should keep me going for quite some time. Just looking forward to Hornady bringing the .423 400 grainers to the market.

Perhaps we can persuade Jamison to add the 10.75x68 to their line up. They produce quite a range of the Nitro Express brass. If quality Horneber brass dries up, they might see the value of production for this fine old caliber.

RCG

I would be sure and load any Bertram brass at very low pressure, its the worst brass in the history of brassdom...About the only thing I have found it to work with is old black powder cartridges.