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Shooting & Reloading - Mausers, Big Bores and others >> Rifles
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Con
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Reged: 24/05/04
Posts: 261
Loc: Victoria
Re: 35 Whelen vs 9.3x57 ? [Re: 9.3x57]
      #128410 - 01/03/09 08:05 AM

Quote:

A .358 on such an improved case ...



I know of such a beast being done right now. Looking forward to hearing how well it goes compared to the 358Win/35Whelen. I think it's to be placed in a 30/06 action to allow Barnes monolithics plus 310gr Woodleigh's to be seated without powder space being compromised.
Cheers...
Con

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DarylS
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Reged: 10/08/05
Posts: 26479
Loc: Beautiful British Columbia, Ca...
Re: 35 Whelen vs 9.3x57 ? [Re: 9.3x57]
      #128426 - 01/03/09 12:28 PM

I'm with you, Rod - a .35x57Imp or 9.3x57Imp would would be cool. The 9.3x57Imp would easily get 2,350fps to 2,400fps with 286gr. bullets and 2,540fps+ with 270's.

Unfortunately, I don't have any '06IMP reamers, or I'd do my 9.3x57 Husky. Heck - a .25/06IMP, .280IMP, 7x57 IMP, .338/06Imp or .35 Whelen IMP reamer would also work. the only reamer I've got that's close is a .220Swift IMP reamer and it would only sharpen the shoulder angle to 40 degrees, for no real advantage- maybe 1gr. capacity more. The case needs to be opened up to a .455" to .457" shoulder diameter with a sharp 35 to 40 degree slope. Even a 28 degres shoudler would bo OK.

How many know the 9.3x62 is almost identical to an Ackley imp case, except for the shoulder angle? the 9.3x62 has identical capacity as would a 9.3x62 Ackley Imp case.

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


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

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szihn
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Reged: 24/06/07
Posts: 2105
Loc: Wind River Valley, Wyoming
Re: 35 Whelen vs 9.3x57 ? [Re: 9.3x57]
      #346044 - 22/10/20 01:24 AM

Well the .375 already exists. The Germans made the 9.5X57 way back in the 20s and maybe before. It's not popular, but it's still around, and I am told my one owner in Reno Nevada that when used with the 235 grain Speer bullet it's a super effective deer killer.

So with the standard German 57MM case we have the 24 caliber 6MM Remington, the 25 caliber 257 Roberts, the 26 caliber 6.5X57 (and it's near-twin the 6.5X55 Swede), no 27 caliber, the 28 caliber 7X57, No 29s 30s or 31 cals on that shell, (but the 7.65 Belgian is a 31 cal Mauser shell, just not THAT Mauser shell) the 32 cal 8X57, no standard 33 or 34 cals, then the 35 caliber 9X57, the 36 cal 9.3X57and the 37 cal 9.3X57.

I have re-barreled 3 Mausers to the 9X57 for customers, but I had a reamer made with a pilot to go with American size 35 cal barrels so they are made for use with our .358" bullets instead of the German/Austrian .356" bullets. Sure makes ammo a lot easier to obtain in the USA, with no more then a set of dies.

I have a swap-barrel rifle started right now on an FN Small Ring Mauser with 2 barrels, each with their own forends and sights as well as scopes. The set also comes with a hand press and 2 sets of dies, one for each caliber and a shell holder. The 2 calibers are 257 Roberts and 9X57. And my 9X57 will use American and Australian .358" bullets. So it's a 25 and 35 caliber rifle set, and should cover nearly every need for a North American hunter. Both barrels will be zeroed with loads that will come prescribed with the set, so if the owner follows the recipes he can simply load the rifle with their individual barrels and the scopes and sights will strike dead on. The gun comes with 100 rounds of each ammunition for each caliber too. So the owner (who ever buys it) will need to buy powder, primers and bullets for future ammunition. I'll zero the 9X57 for 150 yards and the 257 Roberts for 200. I'll zero for the 225 grain .358 Nosler partition with the 9X57 and with the 110 grain Nosler Accu-Bond with the 257 Roberts.

As you might guess, I also see a LOT of merit in the old Mauser shell design.

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Rule303
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Reged: 05/07/09
Posts: 4905
Loc: Woodford Qld
Re: 35 Whelen vs 9.3x57 ? [Re: szihn]
      #346057 - 22/10/20 10:17 AM

A bloke over here has developed a 358 based on an improved 8X57 case. Going by his testing he claims it matched or beats the Whelen for velocity. Me thinks he has it running at max pressure.

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DarylS
.700 member


Reged: 10/08/05
Posts: 26479
Loc: Beautiful British Columbia, Ca...
Re: 35 Whelen vs 9.3x57 ? [Re: Rule303]
      #346059 - 22/10/20 11:44 AM

Yes - likely it is, but then max pressure for the case is about 65,000PSI, while the SAAMI 'standard' max. and the standard for factory ballistics for the .35 Whelen is 62,000psi.

The 57mm case Improved will have very similar (1 to 2gr. less, perhaps) capacity as the .35 Whelen, but given the improved case shape for handling pressure, coupled with perhaps raising the bar slightly in pressure allowable, there is no reason why the .35 IMP cannot match 35 Whelen factory ballistics & likely run a bit higher, in the 2,550fps range with 250's - safely.

Certainly loading it to .35 Whelen standards will be more than suffice for NA game.

I find this site fairly useful. The text is also a good read, dealing with pressures and how they are developed.

http://kwk.us/pressures.html

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


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

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