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Shooting & Reloading - Mausers, Big Bores and others >> Mauser Discussion Forum
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Gundog01
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Reged: 16/05/15
Posts: 291
Loc: Ohio usa
Rechamberig a 9.3x62 to 9.3x74r?
      #265727 - 31/05/15 06:11 AM

Can it be done or has anyone else done it? I think it would be awesome to have a 9.3x74 bolt gun. Any comments or info on this idea or a 9.3x74 bolt gun? Thanks!

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Rell
.375 member


Reged: 03/12/04
Posts: 642
Loc: Oyster Bay, NY, USA
Re: Rechamberig a 9.3x62 to 9.3x74r? [Re: Gundog01]
      #265729 - 31/05/15 07:01 AM

Pretty sure there was a 350 Rimmed Rigby floating around that had been re chambered and rebored for the 9.3x74r.

--------------------
450-400, 9.3x74r and 7x65r.

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DarylS
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Reged: 10/08/05
Posts: 26992
Loc: Beautiful British Columbia, Ca...
Re: Rechamberig a 9.3x62 to 9.3x74r? [Re: Rell]
      #265734 - 31/05/15 09:30 AM

The 9.3x74R case is smaller in diameter at both the base and the shoulder area. The 9.3x62 barrel would have to be set back approximately 1 3/4" so the 9.3x74R reamer would completely clean up the existing chamber - otherwise, no go.

A fatter case could be used, perhaps some .35 or other NE necked up or down to 9.3mm - perhaps.

Careful measuring would have to be made to ensure the 9.3x62's .455" shoulder did not interfere with the re-chamber. Do not believe the .451" for the 9.3x62mm shoulder measurement as listed in some manuals. I've measured 3 different 9.3x62's fired brass and all expanded the shoulders to .454" or .455". (which, incidentally is the same as ANY Ackley IMP on the 'standard case, from .250 Savage to .375Whelen).

edtied

Further- the 9.3x74R base is only .465" nominally, with a .414" shoulder, some 2.039" ahead of the rim's base.

The 9.3x62 has a .475" nominal base measurement with a shoulder of .455", 2.064" ahead of the rim's base.

The barrel would have to be set back, so the 9.3x74R base of .465" was larger than the case body of the 9.3x62mm case- thus my estimate of 1.75", set-back, just to be safe. Not many commercial bolt actions have a shank length that will allow this much set-back.



Edited by Daryl_S (31/05/15 10:35 AM)

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93x64mm
.416 member


Reged: 07/12/11
Posts: 4198
Loc: Nth QLD Australia
Re: Rechamberig a 9.3x62 to 9.3x74r? [Re: DarylS]
      #265739 - 31/05/15 04:08 PM

Gundog01
The performance of the 9.3x62 & 9.3x74mm are comparable
The capacity of the 9.3x62mm = 76grain H2O
9.3x74mm = 83grain H2O
9.3x64mm = 85grain H2O
So yes the 9.3x74mm will if loaded to the same pressure certainly have an increase in performance over the 9.3x62mm - but as Daryl says the set back would leave a rather ugly gap in your stock to say the least!
If you want more performance step up to the 9.3x64mm, it is a very simple reamer job for the barrel - however being a bit fatter in diameter you will lose 1 cartridge in the magazine & require work to the feed rails etc.
Not to say it can't be done, but not with the original barrel
If you can get one in a Ruger No1 then you will certainly have a performer!
93x64mm

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lancaster
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Loc: There's a lighthouse in the mi...
Re: Rechamberig a 9.3x62 to 9.3x74r? [Re: 93x64mm]
      #265744 - 31/05/15 06:09 PM

interesting idea but never heard it was done before. if you want something special make your own wildcat: 9,3x74
just turn of the rim and cut extactor groove

it was available once for the 8x75RS which is itself a 9,3x74R necked down.
this was a real family 8x75RS, 8x75R (I caliber, 8x75S and 8x75(I caliber)

--------------------
Norwegian hunter misses moose, shoots man on toilet
.
bringing civilisation to the barbarians

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DarylS
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Reged: 10/08/05
Posts: 26992
Loc: Beautiful British Columbia, Ca...
Re: Rechamberig a 9.3x62 to 9.3x74r? [Re: lancaster]
      #265751 - 01/06/15 01:52 AM

Quote:

interesting idea but never heard it was done before. if you want something special make your own wildcat: 9,3x74
just turn of the rim and cut extractor groove

it was available once for the 8x75RS which is itself a 9,3x74R necked down.
this was a real family 8x75RS, 8x75R (I caliber, 8x75S and 8x75(I caliber)



Is there a rimmed case 74mm (or 62mm) long with a .475" base diameter?

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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DarylS
.700 member


Reged: 10/08/05
Posts: 26992
Loc: Beautiful British Columbia, Ca...
Re: Rechamberig a 9.3x62 to 9.3x74r? [Re: DarylS]
      #265752 - 01/06/15 02:01 AM

A moot point, 93x64, but the 9.3x62 brass I checked from a Sauer rifle, had 78gr. capacity in Sako brass. My own 9.3x62 cases, if made from WW .30/06 brass, have 80gr. capacity, identical to my slightly oversize .375/06IMP case on WW brass.

The RWS 9.3x62 cases I have show less capacity and higher pressure than the new Nosler brass or WW brass in this ctg. using the same loads.

As it is, the 9.3x62 can actually be loaded up to 65,000psi in a good modern strong action, (anything that is/was chambered for 6mm Rem. or .270 Winchester - for example, good 98 Mausers) the ballistics can be greatly improved over factory ammo, if desired.

--------------------
Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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Wanabebwana
.300 member


Reged: 11/01/13
Posts: 221
Loc: Canada
Re: Rechamberig a 9.3x62 to 9.3x74r? [Re: lancaster]
      #265753 - 01/06/15 02:03 AM

If you have a typical barrel contour rechambering is not an option. The 9.3x74R is a rimmed cartridge designed for single shot and double barreled rifles and drillings and will not function in a typical bolt action magazine without considerable work. Also the 9.4x74R is over 3.7" long which would require a Magnum size action such as the BRNO 602 or CZ550. As stated by others the factory loads of the 9.3x62 and 9.3x74R are identical 286gr at 2360fps. The 74 has greater capacity to give this velocity at lower pressures in hinged action rifles. Do not assume that you can load the case to pressures it was not designed for. If you want more power than a handloaded 9.3x62,in that bore size ,the 9.3x64 Brenneck is the logical choice.
If you are starting from scratch and you select a standard length action such as the Mauser 98.
The 1905 9.3x62 is hard to beat. If you want more power,the .375 Ruger is ideal. If you can live with a single shot bolt action the 9,3x74R can be built fairly easily.
Here is a comparison of the .375H&H, 9.3x74R and 9.3x62.



Edited by Wanabebwana (01/06/15 02:07 AM)

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