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Old 04-25-2009, 08:52 AM
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.257 Roberts Brass from .270 Win?

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Was wondering if anyone has made .257 Roberts brass out of .270 Win Brass?

Last edited by spitfire_er; 04-25-2009 at 08:59 AM.
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Old 04-25-2009, 10:15 AM
Davers's Avatar
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Originally Posted by spitfire_er View Post
Was wondering if anyone has made .257 Roberts brass out of .270 Win Brass?

Yes, it's possible to make .257 Roberts cases out of .270 brass. However you will need a set of forming dies and the case neck will need to be reamed for a .257" bullet. If you have a bunch of 7 X 57 m/m cases it would be a great deal cheaper to form .257's out of them.
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Old 04-26-2009, 05:40 AM
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It's not worth the time and effort IMHO. 257 Rob brass isn't all that difficult to find and there's always 6mm Rem or 7x57 brass if you can't. If you have a lot of 270 Win brass and that's the reason you're considering it, sell it on gunbroker or a similar site. Put what you get and the cost of specialized dies towards 257 (or 6mm/7x57) brass and you should be ok.
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Old 04-26-2009, 07:49 AM
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Yes you can. Try it by taking out the decapping rod from your sizing die, and very lightly lube the upper part of the case (where it will be sized down). Then trim to length and then resize again with the decapping rod and sizer button. See whether or not you need to outside neck turn.
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Old 04-26-2009, 09:14 AM
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You'd really have to work at it and would expect to lose a few along the way.
this is NOT a recommendation...just what some of us had to do back when we either had no money, cases were hard to come by, or both....but those dasy can come upon us again, so I'll post it anyway.

Strip the .257 die of it's decapping assembly...make it a hollow tube.
Use good case lube (Imprerial Die Wax)
Screw the die up in the press until it just barely touches a .270 case when the ram is up.
Screw the die down 1/2 turn.
Run all the .270 cases though the die
Turn the die down 1/2 turn and run all the .270 cases through

Keep doing that last step until they are full sized.

Trim them
Neck ream or outside turn to standard .257 thickness
Reinstall the decapper
Resize them as if they were .257 cases.

May still find that they WON'T chamber. Brass springs back a bit, and the thick brass of the shoulder springs back more than the thin neck...may find that the cases just barely won't chamber. One solution is to grind/stone down the top of a shell holder (always work on the cheap part when you have a choice). that would let you turn the die down a little more...which would let you set the sprung-back shoulder back just a little bit more....it's a size-n-try kind of arrangement.

(NOte: HIDE THAT SHELL HOLDER...it's going to get you in trouble some day.)

Cases would probably need annelaing at this point, as the now shorter cases have their necks in an area of the .270case that wasn't designed to be a neck.

When you're all done, will need to get the volume of your new made cases....compare it to the volume of "real" .257 cases...reduce loads based on the percentage of difference.
Or you can just buy some .257 cases.

Last edited by ribbonstone; 04-26-2009 at 09:16 AM.
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Old 04-26-2009, 10:57 AM
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It used to be common to do that sort of thing. I've done it with .30-06 cases, no sweat. Used a 7x57 die as an intermediate step and lost no cases at all. (I sometimes make .22-250 cases from .30-06/,35 Whelen.)

I use a Dremel tool with a cut-off wheel to get the too long necks close and take them to final length with my case trimmer. If you use a 7mm die, don't install the expander. Then cut off most of the surplus neck and finally run it into the .257 Bob die WITH an expander.

You MAY need to turn necks but that's by no means a certainty! The necks probably won't thicken as much as you may espect. Make a .257 case, seat a bullet and measure the loaded neck diameter. If it needs tuning that will show it.

Annealing after forming IS important or the new necks will soon split.

An alternate thought on thinning the shell holder; I prefer to work on the part that's not quite right instead of changing a part that's good! I like to grind just a tad off the bottom of a sizing die if it's needed for any case that it doesn't properly size. I can always adjust the die up a bit if it's needed but a .473" diameter shell holder can be used for other cartridges and I'd rather keep it the same for those uses.
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Old 04-26-2009, 01:36 PM
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Ribbonstone covered this well but let me add one more workaround that avoids permanent modifications to any of your reloading equipment.

If you think that grinding the top of the shellholder or the bottom of the sizing die may be necessary, instead try inserting various thicknesses of automotive feeler gages between the shellholder and the case head. Be sure to have the decapping pin removed (I keep forgetting to mention this but Ribbonstone said to do that already so....).

This will push the shoulder back an additional amount by the thickness of the gage.... for example, I formed some .257 Weatherby cases and found that for the forming process to work, they had to have a 0.010" feeler gage under the case head or the brass would spring back too much to chamber.

Good luck and mostly what I've found from forming cases is that you want to do it as seldom as possible But there comes a time when there isn't a choice so maybe now is a pretty good time to learn.

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Old 04-29-2009, 10:37 AM
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Thanks for the input guys, I figured that it would be work, and it would be easier for me to just go get some .257 brass. I like to think that I have more time than I actually do!
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Old 04-29-2009, 10:42 AM
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Let me add belatedly that even if a case is fairly new, if you re-anneal the neck and shoulder, you can subsequently push the shoulder back a little further on a tight case.
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Old 05-02-2009, 05:14 PM
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I routinely make 257s from 7x57s and 30-06s using Redding trim dies in one step. Hacksaw the excess off in the the die, debur, trim, debur again, anneal and then neck turn. Why do all this? Because we can! Neck turning is essential to avoid chambering problems and to make all those different cases the same. Pushing a 30-06 sholder back requires special lubricant or extreme care to avoid denting or hairline folds in the neck.
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Old 05-05-2009, 10:12 AM
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I was going to try and make some out of some brass a friend gave me and on friday Gamalile shooting supply called and said winchester 257 roberts brass just came in ......I had some on backorder and they wanted to know if I still wanted it so it will be here on thursday.....and don't you know that I will feel a little sick and will not be able to go to work on friday ......will need some 200yard range therapy to make me feel better
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