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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles
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Ripp
.577 member


Reged: 19/02/07
Posts: 16072
Loc: Montana, USA
Sako .370..
      #123181 - 07/01/09 12:45 AM

Read in the latest SCI magazine last evening that Sako has developed yet "another" new cartridge in .370 caliber--9.3x66 I believe were the metric dimensions..

Allegedly, a bit milder in recoil and yet very close ballistically to the performance of a .375H&H...believe it is loaded with a 284gr bullet or somewhere around that.from the factory..

Ripp

--------------------
ALL MEN DIE, BUT FEW MEN TRULY LIVE..

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Isopeura
.224 member


Reged: 01/06/08
Posts: 36
Loc: Finland
Re: Sako .370.. [Re: Ripp]
      #123197 - 07/01/09 03:25 AM

A Finnish point of view in the matter of 9,3x66 (.370) vs. .375 H&H:

It was about the same time as Sako Model 75 was released, that Sako developed this then proprietary cartridge. It was the first cartridge from Sako since 7x33.

It was then said in Sako advertising that 9,3x66 equals or exceeds the .375 in energy. Ok. The comparison was made using .375 H&H loaded rather mild with 300 gr. Hdy SP and 9,3x66 with then new 250 gr. Nosler Ballistic Tip. This way the new cartridge showed "better" retained downrange velocity and energy than .375 in this setup. This is nowadays referred in Finland as "the most classic example of scam by manufacturer to market a new cartridge".

Actually the 9,3x66 differs from 9,3x62 by only a little (shoulder moved forward a bit and shorter neck - cartridge OAL is about the same, as dictated by magazine box) and the difference is more in pressure level, as the seated bullet eates away the space in cartridge. The actual difference that a handloader has using the same barrel length is 15 m/s (about 50 fps) in gained velocity over the more common 9,3x62 (with 286 gr. bullets). That actually makes no difference what so ever in the field as majority of the bullets are made for 9,3x62 anyway. The thing was that with the new cartridge there was no old rifles to worry about and the pressure level could be set a bit higher. They also used new high energy VihtaVuori N500 -series propellants that made it easier to reach new velocity levels.

IMHO the name is better now, as metrics are boring and lack the nostalgia...

If you want realistic magnum performance from 9,3 mm cartridges, you have to go to 9,3x64 Brenneke.

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Schauckis
.300 member


Reged: 17/07/07
Posts: 151
Loc: Finland
Re: Sako .370.. [Re: Isopeura]
      #123224 - 07/01/09 07:44 AM

Agree on every single point!

I recently saw the case capacities on another forum - 9,3x66 has less than 5% more case capacity than the 9,3x62, whereas the Brenneke has some 15% more case capacity, if my memory serves me correctly.

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A.k.a. Bwana One-Shot

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wombat
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Reged: 06/03/04
Posts: 163
Loc: Australia
Re: Sako .370.. [Re: Schauckis]
      #125293 - 28/01/09 06:22 PM

I have a very nice 9.3x66 custom mauser-allowing a greater overall lenghth of cartridge-that gives 2300 fps with a 320 gn woodleigh solid-load from the VihtaVuori manual with N550 ,I think you would be hard pressed to copy this with the 9.3x62.This load was chrono'd and was not max in my rifle.

Edited by wombat (28/01/09 09:47 PM)

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Ripp
.577 member


Reged: 19/02/07
Posts: 16072
Loc: Montana, USA
Re: Sako .370.. [Re: Isopeura]
      #125314 - 29/01/09 01:07 AM

Quote:

A Finnish point of view in the matter of 9,3x66 (.370) vs. .375 H&H:

It was about the same time as Sako Model 75 was released, that Sako developed this then proprietary cartridge. It was the first cartridge from Sako since 7x33.

It was then said in Sako advertising that 9,3x66 equals or exceeds the .375 in energy. Ok. The comparison was made using .375 H&H loaded rather mild with 300 gr. Hdy SP and 9,3x66 with then new 250 gr. Nosler Ballistic Tip. This way the new cartridge showed "better" retained downrange velocity and energy than .375 in this setup. This is nowadays referred in Finland as "the most classic example of scam by manufacturer to market a new cartridge".






Seems as though every manufacturer attempting to market "their" new products attempt to blur the facts a bit..saw it when they were pushing the new Ruger and Federal cartridges in the past year..either compare different grains or one shot in a 26" barrel and the older cartridge shot in a 22" barrel..or something similar to that...

Ripp

--------------------
ALL MEN DIE, BUT FEW MEN TRULY LIVE..

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Schauckis
.300 member


Reged: 17/07/07
Posts: 151
Loc: Finland
Re: Sako .370.. [Re: wombat]
      #125329 - 29/01/09 05:42 AM

Quote:

I have a very nice 9.3x66 custom mauser-allowing a greater overall lenghth of cartridge-that gives 2300 fps with a 320 gn woodleigh solid-load from the VihtaVuori manual with N550 ,I think you would be hard pressed to copy this with the 9.3x62.This load was chrono'd and was not max in my rifle.



Granted, not chronoed, but:
Norma's 325grs

--------------------
A.k.a. Bwana One-Shot

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Isopeura
.224 member


Reged: 01/06/08
Posts: 36
Loc: Finland
Re: Sako .370.. [Re: Schauckis]
      #125333 - 29/01/09 07:51 AM

The new Norma load (9,3x62/325 gr.) actually comes very close to advertised velocity of 2300 fps using short barrels and I think that with longer barrels this will be exceeded.

The main difference between 9,3x66 and 9,3x62 is in pressure levels. If you increase the level of 9,3x62 to that of x66, the difference is next to nothing.

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