luv2safari
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Reged: 09/11/03
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I am thinking about chambering a set of Valmet 412 barrels to 375 on a 348Win case. They are in 375 Win right now...any comments or suggestions...?? Anyone have a better "cat" to to play with?
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475Guy
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Loc: Kali, US
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That's for an O/U isn't it? Since you're asking, why not the 375 H&H Fl.? Unless of course, you have too much metalwork to rechamber it to that.  
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luv2safari
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While the guns are chambered in 9,3x74r, I think that a 375 FM might be just a bit too much for them. What I would like to get is something in 375 that comes close to the 9,3. Is there another rimmed case about the right size that might get me a bit more push?...maybe the 9,3 case would work 
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mickey
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Well, you could always do the 369 Purdey. 
Do you have a 9.3 that you want to bore out or just rechamber? Why not just neck down the 375 FN case to 9.3?
Sorry for the confusion but in one post you say they are 375 and in the other 9.3, or am I just not reading what I am seeing?
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Lovu Zdar
Mick
A Man of Pleasure, Enterprise, Wit and Spirit Rare Books, Big Game Hunting, English Rifles, Fishing, Explosives, Chauvinism, Insensitivity, Public Drunkenness and Sloth, Champion of Lost and Unpopular Causes.
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luv2safari
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Mike,
They are in the little 375 Winchester, designed for the Big Bore Mdl 94 lever action. I think that using 348 Win case might make a nice round with some pop to it, using .375 bullets.
I'll check rim and base specs for the 375 Win and the 9,3x74r...this might be the way to go. I already have 12/9,3x74r and 0/u 9,3x74r barrels for the Valmet/Tikka receivers, but want to make up something in a .375 diameter. I'll be rechambering the 375 Win barrels.
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4seventy
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In reply to:
What I would like to get is something in 375 that comes close to the 9,3. Is there another rimmed case about the right size that might get me a bit more push?...maybe the 9,3 case would work
The 9.3 X 74 R has I think a thinner rim than 375 Win by about 10 thou and that may cause some problems.
348 win is a much fatter case at the base than 375 win and would take out a lot of chamber metal.
348 actually has a larger base dia than 375 flanged mag.
If you are prepared to do a wildcat cartridge I would think the 405 Win would be a good cartridge to start necking down.
It has a slightly thicker rim and similar capacity to 9.3/74.
Another option to 405 could be 45/70 as the parent case.
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mickey
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luv2
Well the 9.3 is out because of barrel diameter. The 348 would be a snappy puppy if yu have enough material to re chamber it. A shortened 375FN would be the logical answer.
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Lovu Zdar
Mick
A Man of Pleasure, Enterprise, Wit and Spirit Rare Books, Big Game Hunting, English Rifles, Fishing, Explosives, Chauvinism, Insensitivity, Public Drunkenness and Sloth, Champion of Lost and Unpopular Causes.
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luv2safari
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This sounds like a plan...the plan!  I have some 45-70 brass at hand and will take a look. The base size of the 348 and 375 FM were a concern of mine, also. 
The 405 and 45-70 brass make this much easier to get inexpensive brass to fiddle with. 
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luv2safari
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Moonie,
I just checked the specs for the 9,3x74r. The rim on the 9.3 is .052 and the Win is .046...so good there
The base of the 9,3 is .465 and the Win is .415...so good there.
The rim dia.: 9,3....524 and Win .502...so good there.
The shoulder of the 9,3 is only .001 smaller than the base of the 375 Win, so there is no problem with taper...
I think I'll try the 9,3x74r case. In all actuality, I could just chamber it to 375 FM, as 475Guy suggested, but that isn't as much fun as having my own 375LUV2...I have a sh.t load of 9,3 brass and an extra set of 9,3x74r dies that I could have the neck opened up to .375 for much less than some wilder "cat" custom made...now for the reamer...
I have a set of 300 H&H FM barrels in my set that were once 30-06. They have worked out well...well enough that I would not worry too much about the 375FM chambering.
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4seventy
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In reply to:
The rim on the 9.3 is .052 and the Win is .046...
My books must misprint the thickness of the 375 Win rim as 2 different books I have show it to have a thickness of .063" 
I don't have a case to check the measurement.
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mbogo375
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How about 375x2.5 Flanged Nitro Express? If you want you can use the full length 405 case with 375x2.5 FNE dies for a "wildcat" if you long throat the chamber, and still use regular 375x2.5 brass as well. This is what I have to do with my H&H double due to it's very long throat/neck, and I load to 3.40-3.50 OAL. You can get 2300 to 2400 with 270 grain bullets and this setup in a strong action at "modern" pressures, and there is a great deal of "panache" as well.
Jim
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luv2safari
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Moonie...I took my info out of Ctgs. of The World...latest edition.
I checked two of my loading manuals and found the same info that you have...
Maybe I'll go back to the 348 Win...same rim thickness. The Valmets seem to have plenty of meat to take the fatter case.
Now I'll have my "Short Fat luv2 375"...
I just measured my 300 FM Bertram cases; the rims were .060 to .063, while my HDS 375 FM cases are .057 to .062....Quality control... 
As I remember, the thickness for both is .055... 
I think I'll stick with the 9,3 and be just as happy as I have been all along...Happier; I just saved myself a pile of loot!
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NE450No2
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luv2safari
Why not the 444 Marlin case? They are probably stronger, and cheaper than 9,3 cases and you will not have to remove as much metal as with the 348 or 45/70. Check the specks for the 375 JDJ. The Hornady fourth edition has it under the pistol section. They get 2000fps with a 270 bullet in a 14 " bbl.
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luv2safari
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How strong is a 45-110 case? It has just the right everything else I would be looking for...
My biggest worry is rim thickness and chamber meat left at the base.
How much rim thickness difference can I get away with? I want a round with some pop to it, but without having to run up pressures. I'd like to stay around 9,3x74r pressures.
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4seventy
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450#2
I thought about the 444 as well but there is really only a marginal amount of capacity increase over the 375 Win.
Pressure wise, the more case capacity the better and that was why I thought the 405 or 45/70 may be a better option.
If you are going to all the trouble of rechambering a double and making/modifying dies/cases etc the end result would have to be a substancial improvement over the original chambering to make it worth the time, effort and cost IMO.
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475Guy
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Loc: Kali, US
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45-110 brass is hella strong and made by BeLL.
--------------------
Lo do they call to me,
They bid me take my place among
them in the Halls of Valhalla,
Where the brave may live forever.
|
luv2safari
.400 member
Reged: 09/11/03
Posts: 1412
Loc: United States
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I think my "short fat luv2 375" just became the "longluv2 375"...
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