Fire Forming 9.3 x 57

...it's a snug closing but nothing hard...didn't fire form it, but i'll take your advice on the 8x57 and order some...

...trimmed and actually put it right through the 9.3 die...but it stretched in length...so trimmed again...but it stretched again...five or six back and forths...and all of them greased to the 9's and lots of pressure...so it can be done...but WHY?! ;)

(it's a hornady die with a very gentle expander button...i tried a universal expanding die from lee but that was a disaster)
 
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Reguarding the case forming proceedures mentioned. I have a 9x57 mauser not a 9.3x57 but the case forming procedure is the same. I have used 30-06 and 8x57 brass and actually prefer the 06 cases. I find that when the 8x57 brass is expanded the case shortens about a mm. No big deal but I prefer to have the cases the full 57 mm long. So I trim the 06 brass to approx. 58 or 58.5 mm in length. I lube the inside of the neck with graphite and run over a .338 expander then over a 358 expander. I find no need to expand larger because the shoulder area of the 06 case is much larger than the outside dimension of the x57 neck (true for the 9 and 9.3). Lube the case and into the FL size die that is backed off about 1/2 turn. This results in a case that will chamber with some resistant when you close the bolt. Chamfer case load with my regular load and use these for targets. Perfectly fireformed cases everytime. Re-check fireformed cases for length and trim if required . You can anneal at this point. I have some cases so formed that are approaching 10 reloads without losing a single case.
 
nw mb said:
...it's a snug closing but nothing hard...didn't fire form it, but i'll take your advice on the 8x57 and order some...

...trimmed and actually put it right through the 9.3 die...but it stretched in length...so trimmed again...but it stretched again...five or six back and forths...and all of them greased to the 9's and lots of pressure...so it can be done...but WHY?! ;)

(it's a hornady die with a very gentle expander button...i tried a universal expanding die from lee but that was a disaster)
Click to expand...

Hmm.. I put brand new Prvi 8x57 brass through my 9.3x57 resizer die, also Hornady die set, without trimming before or after. Chamber fit was excellent.
 
Suther said:
Who makes bullets that expand at x57 speeds? I was reading an article on ballistic studies (I think it was) and they mention that most .366 bullets are designed for x62 and x74r speeds and are unreliable in the x57. Anyone care to comment on this?

Also, I thought people were using - 06 cases for x62 not x57?
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I had a Norma 232 grainer come apart on a WT doe at something like 2000 fps. The core exited but the jacket was found in pieces.
 
nw mb said:
...a lot of people form 9.3 x 57 from 8 x 57

...seems like some use 30-06 casings

...since i don't have 8mm but have a whack load of 06 i just wanted to ask how to do this using filler

...the shoulder on the 06 casing needs to be set back by 1/10"...it won't chambre as is

...then following that starting at 10% of case capacity load a medium-burning powder...insert spacer...fill with filler (cream of wheat) to bottom of neck...and seal and fire...may need to adjust up from there

...will that do it?

...oh and i have to trim the case length by 2/10"

...can i use unique powder?

...thanks
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No spacer required, just pour your filler right on top of the powder. I've fire-formed a few 100 cases (mostly 45-70 to some other long obsolete BP cartridge) with anywhere from 8 to 11 gr of Unique with no noticeable difference in results
 
Suther said:
Who makes bullets that expand at x57 speeds? I was reading an article on ballistic studies (I think it was) and they mention that most .366 bullets are designed for x62 and x74r speeds and are unreliable in the x57. Anyone care to comment on this?

Also, I thought people were using - 06 cases for x62 not x57?
Click to expand...

most of the bullet designed for .366 will work in a 9.3x57.
 
Why not? said:
nw mb,

When reforming 8X57 brass, I neck up to 40 cal first, then resize to crush fit the case in the chamber. The bolt should just barely close on the case. That way, you have a perfect fit in the chamber, and will not stretch the brass. I have also used '06 brass a few times, and they did not need neck turning.

I always used full power hunting loads to form brass while sighting and practicing with the rifle. The 9.3X57 is a fine hunting round for big game, and forty cases will last you a long time.

Ted
Click to expand...

nw mb said:
...well i spent last night figuring this out more to prove to myself that i could turn a 30-06 case into a 9.3x57...and i did

...but i'm just going to save myself all the gyrations that went into this and buy a bag of 8x57 ;)
Click to expand...

rokoro said:
Reguarding the case forming proceedures mentioned. I have a 9x57 mauser not a 9.3x57 but the case forming procedure is the same. I have used 30-06 and 8x57 brass and actually prefer the 06 cases. I find that when the 8x57 brass is expanded the case shortens about a mm. No big deal but I prefer to have the cases the full 57 mm long. So I trim the 06 brass to approx. 58 or 58.5 mm in length. I lube the inside of the neck with graphite and run over a .338 expander then over a 358 expander. I find no need to expand larger because the shoulder area of the 06 case is much larger than the outside dimension of the x57 neck (true for the 9 and 9.3). Lube the case and into the FL size die that is backed off about 1/2 turn. This results in a case that will chamber with some resistant when you close the bolt. Chamfer case load with my regular load and use these for targets. Perfectly fireformed cases everytime. Re-check fireformed cases for length and trim if required . You can anneal at this point. I have some cases so formed that are approaching 10 reloads without losing a single case.
Click to expand...

JJ-65 said:
Using 06 brass, the new neck is made up of brass from the body and shoulder. with a bullet seated the case will not chamber.
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JJ-65,

As posted above, that has not been my experience in the rifles I have loaded for, nor apparently that of others.

You are correct, however, that in many case-forming operations where neck diameters are being changed, they do need to be turned. Your heads-up is certainly warranted, though, because while the formed brass will chamber perfectly while empty, the problem will not show up until one attempts to actually chamber a round that has a bullet seated.

It all depends on the size of the chamber neck, and not all chambers are the same. The short answer is that using 8X57 brass will work almost every time because the necks will be getting thinner. ;)

Ted
 
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