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The 7x57 = 1.470" to the beginning of the shoulder.
The 8x57 = 1.500" to the beginning of the shoulder.
Both cartridge cases are 57MM in length.
What was the question again???? Paul B.
Compare the O D at the bases and shoulders. UIM the 8mm is larger Around. Jerry
jwall- *** 3100 guy***
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From Above ^^^^^^^^
"Compare the O D at the bases and shoulders. UIM the 8mm is larger Around."
There is NOT as much diff as I thot. It looks a little larger due to the 8mm neck compared to 7mm neck.
7X57 - Base OD = .471
8X57 - Base OD = .469
7X57 - Shold OD = .431
8X57 - Shold OD = .434
Jerry
jwall- *** 3100 guy***
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Speed is Trajectory's Friend !!
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Call it the 7mm/8mmx57 Creedmauser.
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Might be better to simply stay with the 8mm bore and use 7mm bullets and a sabot. For extreme range, 6.5mm bullets in an appropriate sabot. Larger base area results in higher velocities, no bullet deformation from rifleing means a better and more consistent BC. Regardless of how it's done, there is little doubt this will be an exciting development. Before we jump right into it though, we might want to consider necking up the 6mm Remington instead. Has anyone given any thought to the 7.5x55 Swiss necked down to 7? GD
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Campfire Outfitter
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Using the 8x57 case and resizing it to 7 probably makes as much sense as reducing a 284 bore to 277...............
"...A man's rights rest in three boxes: the ballot box, the jury box and the cartridge box..." Frederick Douglass, 1867
( . Y . )
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The only real difference between the 8x57 and 7x57 case is that the shoulder on the 8x57 is further forward by 0.099". It does then have additional case capacity. Enough to be worth the effort? Hard to say.
I like the 7x57 as is. If the 7x57 is built on a standard length action, leade allowing, you can seat bullets out to a longer COAL and thereby increase the case capacity without resorting to any wildcat shenanigans.
But if it scratches an itch you have, have at it!
If I have the need for more capacity, I bust out the .280 AI.
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Here are some maximum dimensions for the two cartridges according to CIP, with mm measurements converted to inches:
7x57 8x57
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Rim Thickness: .0453 .0512
Rim Diameter: .4764 .4705
Head diameter: .4728 .4701
Shoulder dia: .4299 .4311
Shoulder length: 1.7260 1.8190
Shoulder angle: 20.90° 19.10°
The 8x57 values were based on the 8x57 IS cartridge data. SAAMI values for the same cartridges differ a bit from CIP values. Most cartridges will have actual measurements less than those listed here. Using the approximate volume values in Ken Howell's cartridge book, the 8x57 case will have about 6% greater capacity. Name? Call it the 7mm Bandukwalla, or 280 or .284 Bandukwalla. With a British accent, it might be the 275 Bandukwalla. --Bob
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Its all right to be white!! Stupidity left unattended will run rampant Don't argue with stupid people, They will drag you down to their level and then win by experience
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Call it the 7mm/8mmx57 Creedmauser. ........ Amazing that a "Creed" comment didn't show up until page 7...... While I was thinking Germanic stuff like 7mm Creedenscheutzen.
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Darn, it coulda been the parent case for the .270 Ingwe...
"...the designer of the .270 Ingwe cartridge!..."
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Here are some maximum dimensions for the two cartridges according to CIP, with mm measurements converted to inches:
7x57 8x57
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Rim Thickness: .0453 .0512
Rim Diameter: .4764 .4705
Head diameter: .4728 .4701
Shoulder dia: .4299 .4311
Shoulder length: 1.7260 1.8190
Shoulder angle: 20.90° 19.10°
The 8x57 values were based on the 8x57 IS cartridge data. SAAMI values for the same cartridges differ a bit from CIP values. Most cartridges will have actual measurements less than those listed here. Using the approximate volume values in Ken Howell's cartridge book, the 8x57 case will have about 6% greater capacity. Name? Call it the 7mm Bandukwalla, or 280 or .284 Bandukwalla. With a British accent, it might be the 275 Bandukwalla. --Bob I like the way you think; I'll call it the 275 Bandukwalla
Last edited by Bandukwallah; 04/18/19. Reason: Spelling
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Here are some maximum dimensions for the two cartridges according to CIP, with mm measurements converted to inches:
7x57 8x57
--------------
Rim Thickness: .0453 .0512
Rim Diameter: .4764 .4705
Head diameter: .4728 .4701
Shoulder dia: .4299 .4311
Shoulder length: 1.7260 1.8190
Shoulder angle: 20.90° 19.10°
The 8x57 values were based on the 8x57 IS cartridge data. SAAMI values for the same cartridges differ a bit from CIP values. Most cartridges will have actual measurements less than those listed here. Using the approximate volume values in Ken Howell's cartridge book, the 8x57 case will have about 6% greater capacity. Name? Call it the 7mm Bandukwalla, or 280 or .284 Bandukwalla. With a British accent, it might be the 275 Bandukwalla. --Bob I like the way you think; I'll call it the 275 Bandukwalla
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I like the way you think; I'll call it the 275 Bandukwalla. B- Thank you. Thank you very much! --Bob
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Is that you Elvis ?
jwall- *** 3100 guy***
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Do I detect a hint of sarcasm in some of these replies? Nah, couldn't be; it must be my imagination.
By my calculations, the 7mm/8mm Mauser (I just named it!) would have about the same capacity as the 7x57 Ackley Improved, or around 61.4 grs water. Contrast that with the standard 7x57 at 55.5 grs, and the 7mm/08 at 52.2 grs. That represents a 10% increase over the 7x57, and 17% increase over the 7-08. Help me out: If what you're proposing is virtually the same as the 7x57AI, then why wouldn't you just chamber a rifle in 7x57AI, use the 8x57 brass for forming (if need be), and be done with it? I'm not trying to be sarcastic, just trying to figure out what's new and improved over something virtually identical that already exists? Right, or he could join the 21st Century and just build a 7mm WSM, short action and all. (I'll be here all night, be sure to tip the waitress.)
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Prepare to swoon: An 8x57 necked to 7mm Ackley tight neck fast twist heavy bullet 1000-yard one-holer.
Did I miss any fads? Did you fit Creedmore in there,?
I like to do my hunting BEFORE I pull the trigger! There is only one kind of dead, but there are many different kinds of wounded.
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I remember Jon R Sundra doing parallel studies on the 8x57. 8x57 JRS is what it shall be named.
I like to do my hunting BEFORE I pull the trigger! There is only one kind of dead, but there are many different kinds of wounded.
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Is that you Elvis ? jwall- Probably not. Elvis has left the building. --Bob
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I don't have a 8x57 but I do have three 7x57s. Does anyone know where I may buy Lapua 7x57 ammo or brass? No, well that is why I am thinking about buying 8x57 Lapua brass and running them thru a 7x57 die. That should work, right?
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I don't have a 8x57 but I do have three 7x57s. Does anyone know where I may buy Lapua 7x57 ammo or brass? No, well that is why I am thinking about buying 8x57 Lapua brass and running them thru a 7x57 die. That should work, right? It should work just fine
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