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Reloading 7mm Mauser (7X57)
 Moderated by: Slingshot, Rockydog, klallen, DesertMarine, -6
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 Posted: Sat May 15th, 2010 03:32 PM
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Rmingtn
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So I bought 50 rounds of 7mm Mauser about a decade ago, when I got my hands on a beutiful Mauser.  I've sent a few rounds through the rifle, but I don't like shooting steel jacketed boolets.   Wait...  Boo-,  bu-,  BULLETS.  Dammit, now -I'M- starting to do that! 

Anyways, they are brass cases, look real nice.  Berdan primed.  With "K39 7m.m." as a head stamp.  Yes, periods and all.  The primers don't look crimped or sealed.  The powder was chopped like little stretched squares, greyish black, and after a poke with a brass rod 90 percent of it came out freely, not chunky, stuck, or sticking to each other.

The boolet-....  Is lead core, with a soft steel jacket.  The crimp really went into the bullet.  And the crimp is not a roll crimp, it's of the "factory" type.  I weighted the boolet at 140grains.

The boolet was very damaged during crimping.  As far as I can tell there was no groove.  They just decided to make one while crimping the brass.  I don't know if these are re-manufactured boolets as I didn't think to ask.  I want to reuse the primed brass, with new powder and boolets.

I don't like unknowns, and since the primer is a big one, I was thinking of going for a light boolet, and a minimum powder charge.  Then chronying the bullet to make sure the velocity isn't to low/high.

The rifle is in great condition.  Everything was kept original, and the barrel not only has rifling, but sharp rifling.  But I still want to keep pressures low as this is an original, and I know they can't handle max loads that modern rifles can.

Should I drop the boolet down to 115 grains?  Or use a 140 grain?






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 Posted: Sat May 15th, 2010 03:54 PM
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Rockydog
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Rmngtn, This is very doable. You can use whatever bullet or boolit you wish. You said "a minimum powder charge" just don't drop below published starting loads with some powders like 4350, this can be bad juju. You might try some 4895 youth loads, I think there are some published on the hodgdon site. Trail Boss with cast boolits might work well too. RD



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 Posted: Sat May 15th, 2010 09:09 PM
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TMan51
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Rmingtn, there are times when just buying 100rds of new brass make sense.  This could be one of them.



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 Posted: Sat May 15th, 2010 11:16 PM
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Rmingtn
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Yeah. I know. It's just I don't like to waste good brass.

Sadly, I'm looking into the Berdan de-priming tools right now. And some new Berdan primers.

I know it's only 50 pieces of brass. But the good Lord had that brass made for a reason.

And that reason, is to give me a reason for more reloading equipment:

Wife: "What are you ordering now?"

Me: "Berdan priming tools. It's cheaper then a new press."

Wife: (eyes glazing over) "Whatever, as long as you're saving money I guess."

I've found that the truth, sprinkled with truth that has absolutely nothing to do with the previous truth is good. Technically it's not lying.



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 Posted: Sun May 16th, 2010 12:17 AM
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TMan51 wrote: Rmingtn, there are times when just buying 100rds of new brass make sense.  This could be one of them.

I agree... I gave up trying to scrounge 7X57 brass - all you get is a bunch of mismatched junk.

I ordered 100 Prvi cases from http://www.grafs.com after I shot and reloaded a box of Prvi loaded ammo.. I've got four firings on the box so far... I used my new Lee collet dies, and am well satisfied with them...:thumbs:

Last edited on Sun May 16th, 2010 12:18 AM by 3006 user



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 Posted: Sun May 16th, 2010 01:37 AM
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DesertMarine
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I wish I could have thought of something like Rmingtn, might still be married.  Question, what is that?  Answer, motorcyle.  Question, whose is it?  Answer, mine, I just bought it.  Reaction, mumble, mumble, mumble.  Didn't get any that night.



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 Posted: Sun May 16th, 2010 02:11 AM
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Rmingtn
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3006 user wrote: TMan51 wrote: Rmingtn, there are times when just buying 100rds of new brass make sense.  This could be one of them.

I agree... I gave up trying to scrounge 7X57 brass - all you get is a bunch of mismatched junk.

I ordered 100 Prvi cases from http://www.grafs.com after I shot and reloaded a box of Prvi loaded ammo.. I've got four firings on the box so far... I used my new Lee collet dies, and am well satisfied with them...:thumbs:

Oh, I'm still buying brass.  That exact type is already ordered as a matter of fact.  I was wondering if I had made a good choice.  Thanks for the review! 

Yeah.  Buying a motorcycle might be a bit much for even my BS to work. 

Thanks again guys.



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 Posted: Sun May 16th, 2010 04:17 AM
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Rmingtn, You dont need depriming tools. Just find a 1/4" rod about 6" long. Fill the case with water up to the base of the neck, place the case in a shell holder on your bench, insert the rod to the top of the water, wrap a towel around the whole thing, give her a mighty rap with a large hammer and it should hydraulically pop the case out. Of course a 7mm rod would work better. Perhaps a 7mm bolt? RD



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 Posted: Sun May 16th, 2010 12:11 PM
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Rockydog wrote: Rmingtn, You dont need depriming tools. Just find a 1/4" rod about 6" long. Fill the case with water up to the base of the neck, place the case in a shell holder on your bench, insert the rod to the top of the water, wrap a towel around the whole thing, give her a mighty rap with a large hammer and it should hydraulically pop the case out. Of course a 7mm rod would work better. Perhaps a 7mm bolt? RD

Rockydog, I laughed at this one.

I did this with a bunch of .303 brass many years back, it's definately an outdoor exercise.  But it does work.

Between finding primers, and making a mess, one pass was enough.  But the quantity of Berdan primed stuff laying around at the range these days is amazing, can steel cases be reloaded?



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 Posted: Sun May 16th, 2010 12:29 PM
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 But the quantity of Berdan primed stuff laying around at the range these days is amazing, can steel cases be reloaded?

Theoretically, yes, but IMO it's not worth the grief. Finding primers to fit, the wear and tear on your dies and gun, especially the extractor is something I would avoid.:sad:

Last edited on Sun May 16th, 2010 12:34 PM by 3006 user



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 Posted: Sun May 16th, 2010 01:10 PM
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Wow, I use to reload berdan cases in 1960. only for thinks that had no boxer primer available. I'd not wast time and money reloading any berdan cases today, nor any steel cases. I'm cheap, but I'd not fire steel jacket bullets in any rifle.



 Posted: Sun May 16th, 2010 02:46 PM
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I should have thought of the water idea. Being a Hydraulic Journeyman and all... But I don't mind getting some new tools.

I guess it's more about learning to reload something new, then really having to use this brass. But that's reason enough for me.

I'm going to try the hydraulic method today. Just to have some fun.

Going to the range tomorrow, gonna make some fresh brass! AND collect a few hundred .223 from other un-loaders as well.



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 Posted: Mon May 17th, 2010 04:51 PM
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Well, to get back to the original question, if the bullets you pulled weight 40 gr., then you can use 140 gr, bullets. Of course you have to at least resize the neck sothat they will hold the bullets but other than that there should not be any problems. I did it for years with corrosive GI ammo. I'd pull the bullets set the powder aside, deprime the GI case and remove the crimp, reprime and put the powder back into the case and seat a 150 gr. Sierra bullet in place of the FMJ military bullet. I finally decidedthat was a bit of a PITA and pulled all the bullets, salvaged all the powder weighing every tenth round to get an average,resized all the cased and reloaded with proper hunting bullets. (The 150 gr. Sierras.) Nice two week project that left me with a bit over 600 rounds of loaded 30-06. The ammo was all one lot of LC43 WW2 ammo.

As far as steel jacketed bullets being a problem, I haven't checked latelt but when I had a 6.5mannlicher-Schoenaur, about all the ammo one could find was Norma and their sporting ammo had mild steel jackets. They never were a problem and probably would not be a problem today if some low life scum hadn't stolen that rifle.Currently, I have 5 boxes of Norma 100 gr. .257 Robt. ammo and while they look like they're copper jacketed bullets, a magnet proves otherwise. Look at it this way, your FMJ 7MM ammo is most likely military stuff. Militaries shoot lots of ammo, especially in wars. If that steel jacket was hard enough to damage a bore, they sure as hell would not be using it. I'd be more worried that the primers are corrosive than will the bullets wear out my bore.

From the Norma web site:

orma hunting bullets

– A century of experience and development
For 100 years, the golden rule at Norma has been precision and quality. Continuous progress stretching from the days of steel-jacketed bullets to today’s precision bullets with gilding metal jackets and bonded cores has given Norma a leading position in the world. The reason for that is simple – thoroughly planned production and tight control over everything from casting to the final product.

------------------------------------------------------------------------------------------------------------

Google Norma Ammunition and go to components which is where I found this. I guess they stopped using steel jackets but if you can find some older Norma ammo, check the bullets out with a magnet. BTW, that .257 Bob ammo is mighty accurate in a Ruger #1B I have.

Paul B.



 Posted: Tue May 18th, 2010 03:08 PM
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Thanks for the reply. I guess I'll shoot the bullets. Seeing as the brass is on the way now. I read up on berdan primers. And I thought having 5 sizes of primers was a pain! I'll keep the tools. But I think I've give berdan priming a rest.



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 Posted: Sun Mar 25th, 2012 12:44 PM
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make your own brass

I make mine from 270 win



 Posted: Wed Mar 28th, 2012 05:53 PM
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A couple more thoughts on this. One, is that 7x57 ammo corrosively primed or not? A lot of that berdan primed stuff is and if you do not properly clean you barrel, it'll be toast.
Also, if you shoot Norma ammo, it may look like a copper jacket but put a magnet to the bullet and you might get a big surprise. When I had my 6.5x54 M/S before it was stolen, I shot hundreds of those Norma 140 and 160 gr. mild steel jacketed bullets through it's very nice bore and never had a problem.
A few years back I bought a Ruger #1B .257 Robt. to add to my collection and it came with 100 rounds of Norma ammo with copper jackets that clung very nicely to a magnet. It's extremely accurate in that rifle BTW. Too bad Norma discontinued the round. :sad:
Paul B.



 Posted: Sat Jun 2nd, 2012 12:09 AM
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I have a Winchester model 70 in 7X57.  Its beautiful.  I made some cases from 30-06 and work every bit as good as factory which up here is $90 for 100.  06 cases are free. 

If you want a few loads let me know.  My gun shoots 139 grain and 175 grs pretty good. 

Never tried the ammo that you speak of.



 Posted: Sat Jun 2nd, 2012 03:27 AM
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I believe K39 would indicate Kynoch, 1939. British, made on contract for some other country. Two, no, three things here: It is absolutely corrosive primed. It will put potassium chloride salt into the pores in your barrel, assuming the primers go off at all. Second, that flake powder may or may not be stable after all these years. Thirdly, the cases will very likely split, may even head separate, when fired. Brass grows brittle with age. Don't take a chance. Your face might end up looking like the Miami Chomper got you.......



 Posted: Sat Jun 2nd, 2012 03:46 PM
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Brass goes brittle with age? :confused: Oh really. I've shot Winchester 30-30 ammo that was at least 90 years old. Of course the brass was ruined because of the mercuric primers but other than that it was good stuff. Yeah, they were corrosive as well and I did properly clan the barrel.
I once bought 100 rounds of Remington .308 Win. brass and loaded up my pet loads. I did it early in the year as it got too hot in my shed during the summer to do any serious loading projects. Come late September when I went out to check the sights on my rifle, I got weird flyers and the necks had split on firing on the shots that were out of the group. Then, when I was loading another round to shoot again, I noticed the bullet was loose enough that I could remove it with two fingers. When I inspected the rest of the loads, I found that over 30 percent had season cracked.:sad: I pulled the bullets from the ones that had not cracked, salvaged the powder and primers and annealled the necks of that brass. It's been working just fine ever since.
Paul B.



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