Home Forums Hunting & Shooting Ask The Gunwriters 8 x 57 Necked Down to 7mm

Regarding the title: what cartridge results from necking down the 8x57 to 7mm and trimming back to 57mm with no other changes? No, it isn't the standard 7x57mm Mauser, since the shoulder length and angle are different. And it has probably 5% greater capacity than the 7x57 Mauser, and perhaps 13% greater capacity than the 7mm-08.

I think it is the 7x57!

I am sort of with kenster99 on this one but if you have done the calculations I'll take your word for the extra case capacity. I guess my question would be why? If you want more capacity than the 7x57 just get a .280 Remington and save a lot of messing about.

Assuming speeds in the 2800-2900 fps area for a standard 7X57, 5% greater case capacity should be good for about 1.5% greater velocity, i.e. around 42 to 43 fps more velocity at the same pressures.

Prepare to swoon: An 8x57 necked to 7mm Ackley tight neck fast twist heavy bullet 1000-yard one-holer.

Did I miss any fads?

I could just use my 7x61 S&H. But that is not what I am asking. It would be a 7x57, but not a 7x57 Mauser. Does this cartridge already exist, and if so, what is it called?

7x57 Fulzehrund

You could call it a .280 Mauser...

I'll go .323 Mouser.

Yes it does exist, the 7mm Redundant

284 mauser

Man you can sure tell that hunting season is over. Looks like were in for some doozies this spring. powdr

283 Chevy

why bother ... the 7x64 Brenneke the real 280 and well in advance.

Ok, I have a 8x63mm in a pre-war Mauser,barrel is marked that way

I think it would give you similar case capacity to the 284 win, but a little less IIRC.

Let me understand you want to take an 8 x 57 and neck it down to 7mm? Sounds like a hell of a cartridge to me, should perform well, and it might get a good monicker in time. Can wait to see it chambered in rifles!

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.

Why is it that a guy asks a simple question and all he gets are questionable replies. Much like the simple question about annealing that was asked on here a few days ago.

Guys, all he is asking is what is the cartridge called. How [bleep] hard is that to understand? He's not saying that should be the next new wonder cartridge that we all can't live without.

The .284 has 64.6 grs water vs. appx.61.4 for the 7mm/8x57. So you are very close.