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Igorrock
.400 member

Reged: 01/03/07
Posts: 1684
Loc: Finland

Re: Mystery double in mystery caliber [Re: DarylS]
#390986 - 05/04/25 03:50 PM

It seems that local 9,3x53R case would fit with some alternations. It´s base diater is 12.37 mm (0.487 in). Rim diameter is too big (14.48 mm (0.570 in) versus 12,33 mm) but it´s easy to trim. Same with rim thickness (1.60 mm (0.063 in) versus 1,15 mm).
The only thing is if the 9,3 mm bottle neck case would open to 10,75 mm ???

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lancaster
.470 member

Reged: 06/05/08
Posts: 9455
Loc: There's a lighthouse in the mi...

Re: Mystery double in mystery caliber [Re: Igorrock]
#390989 - 05/04/25 05:03 PM

10,75 Gründig

10,75 Springer's

9,3x53R will open up fine with one step between, maybe 10,0 mm inside than going to 10,75. I have a 10,75x52R Springers die set and can do it for you. resize 8x56R Privi to 10,75 and it works fine.

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Norwegian hunter misses moose, shoots man on toilet
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Igorrock
.400 member

Reged: 01/03/07
Posts: 1684
Loc: Finland

Re: Mystery double in mystery caliber [Re: lancaster]
#390994 - 06/04/25 12:19 AM

Quote:

I have a 10,75x52R Springers die set and can do it for you. resize 8x56R Privi to 10,75 and it works fine.

Do you mean that Springer shells could shoot in Gründig chamfered rifle ?

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lancaster
.470 member

Reged: 06/05/08
Posts: 9455
Loc: There's a lighthouse in the mi...

Re: Mystery double in mystery caliber [Re: Igorrock]
#390995 - 06/04/25 02:01 AM

look at the measurments, seems to be but for fireforming. anyway, with a high grade double rifle like this there is no way around a proper die set.

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

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Igorrock
.400 member

Reged: 01/03/07
Posts: 1684
Loc: Finland

Re: Mystery double in mystery caliber [Re: lancaster]
#391003 - 06/04/25 04:29 AM

I just found one 10,75 Gründig die set for sale. I have to ask rifles owner to order them.

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