The next custom an Oberndorf M98: What to chamber it in?

What to chamber the Oberndorf in?

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Ardent said:
I’ll be doing the Jeffery feed work, and yes inletted for the Oberndorf bottom metal which I’ll likely use, with a Rigby style drop floor plate.
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Is the 500 Jeffries feeding work any different than another cartridge?
Whose bottom metal will you use?
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Ardent said:
I’d saved that blank for ten years, so I’m glad to see it shaping up, even tried to sell it on here for under a grand Canadian as a roughed Mauser stock and no takers. The uncut wood’s worth twice that let alone the time, so now I’m glad I didn’t find a buyer. :p I’m just about fully married to the .577-500 Jeffery wildcat I made here as the chambering. The only real purpose I need more guns for is an all out stopping rifle for Grizzlies, I actually don’t think this is the right path but a hot belted magnum isn’t fitting my gut feel for this project. Plus, I like to experiment. If the .577 Morrison doesn’f work out I’ll back peddle to a .500 Jeffery. Was big on that 10.75x68 thought, but seeing as I’m fully stocked for .375s picking up .404 bore didn’t seem sensible.
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I remember that ad, was seriously considering making you an offer. Only thing holding me back was the channel opening was a bit too wide for my rifles. Glad to see it going into service. Looking forward to seeing her completed.
 
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Couple of minor updates, doing two builds as I couldn’t decide between the .577 and the .375-10.75 range non-belted.

The case in the middle is my .375, between a 9.5x57 case and a .380 Howell. It’s just a 9.5x57 reamer run to .30-06 case depth. The .577-500 Jeffery maxes the action but will work, same fit as a .500 Jeffery in the 98. In other words tight.

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Began King barreled up and chambered a 375-06 for me many years ago. Around mid-1970s or thereabouts. It had the standard 17.5 degree shoulder. I used it for a few years, then discovered the 9.3X62.

He also did two for Grant Lortie. He used them for a while and then had him recut the chambers with a 30-06 Ackley reamer with the pilot bushed to fit the 375 bore. The cartridge looked a lot like yours, buy got very little more velocity than the standard 375-06.

Great fun, this custom stuff.

Ted
 
9.3mauser said:
... so it's a 9.5x63 ???
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Been struggling with what to stamp on the chamber and I’ll give that proper consideration, I like the Germaness of it. :d

The barrel on a side note is the integral rib, sight, and stud half octagon Oberndorf .30-06 barrel that had the dark bore. Just got the rebore back to .375 and she turned out beautifully, was a tough call between .338/.358/9.3/.375. In the end .375 won as my loading bench is bending under the weight of .375 components.
 
Considered it for the ease of just running .35 Whelen into a .375 Whelen die to form brass. On this the shoulder’s moved forward substantially and steepened, and the body blown out straighter. Once in awhile the .375 Whelen can have headspace hiccups when improperly handloaded and wanted to nip that in the bud, and gain a few grains of powder for the trouble.
 
That she is! Oberndorf commercial sporter from the golden era. Bore was shot, which is a blessing, as I got to build what I like. That action’s actually the .375 now, mocked up with the .577-500 in it for play. I have an RSM I may stuff that into, though it fits in a standard M98. Have two other Mauser actions here so still may do that just because it’s possible.
 
Ardent said:
That she is! Oberndorf commercial sporter from the golden era. Bore was shot, which is a blessing, as I got to build what I like.
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I could see that action in a 20" full stocked rifle with a nice old Lyman or Redfield receiver sight chambered in either 6.5x57, 7x57 or 9.3x57.
 
Just finished the last chambering operation on the .375 Kemano today (took two reamers), all done tweaking, shooting 235gr ER Raptors at 2,750fps, more room for another grain or two but that’s plenty for me. Forming brass I just load factory .30-06 and fire, trim the neck, and load. Little ring on the .30-06 shoulder is the crush headspace I set tight to make forming easy. Alternatively the cream of wheat method and a 7x57 case pops out ready to load cases too. For data it’s nearly identical to .375 Whelen Ackley Improved.

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That is a pretty handy game gettin' cartridge... in a trim, light rifle, that would be a joy to carry and shoot!
 
For sure, same thing ballistically they have identical case capacities. Just set this up for pointier & tipped bullets, was struggling with seating depth on the more slippery .375 bullets in the mock up rounds (.375-06 & Scovill / Hawk), so used a 57mm case length improved. Icing on the cake was headspacing it to fireform .30-06 by the Douglas / c-fbmi method to make components simple. Will be loading it with 200-235grs, 235s will be the standard I’m sure.
 
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