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Thread: Forming 257Roberts into 6.5x257

  1. #1
    Boolit Mold
    Join Date
    Dec 2008
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    3

    Forming 257Roberts into 6.5x257

    Hi, new here, I recently acquired a rifle from my deceased uncle, a sporterized Japanese Arisaka, rechambered in 6.5x257roberts. From comparing the brass that came with the rifle, 257 and 6.5x257 are pretty much the same except the mouth is opened up to except 6.5 cal. Would like to reload some newer brass, but was thinking all I need to do is fire 257roberts cartridges and that would form the brass to 6.5x257. I found a box of new Remington 257 Roberts at a recent gun show, I'm pretty sure this will work, but is this the right way and safe way. I have a set of RCBS dies (6.5x257) that came with the rifle. Does anyone here reload for this caliber?? Appreciate any info I can get, rich

  2. #2
    Boolit Master



    skeettx's Avatar
    Join Date
    Jul 2009
    Location
    Amarillo, Texas
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    2,492
    Hello
    Shooting 257 Roberts in a 6.5 x 257 is safe but not accurate and a waste of money.
    You can just buy brass and run it up in the sizing die and the elliptical expanding ball will
    open up the mouth of the brass.

    https://www.gunbroker.com/item/754981605

    http://www.calguns.net/calgunforum/a.../t-734555.html

    Mike
    NRA Benefactor 2004

  3. #3
    Boolit Mold
    Join Date
    Dec 2008
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    OK, Thanks Skeettx, I was mostly concerned about safety, not accuracy. Figured it would be easier to fire form than run them thru the sizing die and possibly crumple some necks.

  4. #4
    Boolit Master 15meter's Avatar
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    Redding makes a series tapered expanding plugs, look up those. They should expand without crushing neck/shoulders with proper lubing.

  5. #5
    Boolit Master ammohead's Avatar
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    You are only enlarging .007" I don't think neck splitting will be a problem. If it will fireform it will size up. Use case lube in the neck and be generous.

  6. #6
    Boolit Master
    Join Date
    Oct 2007
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    Rich e just get a set of 6.5X.257 dies and load them up.
    They come with a tapered expander ball.
    I know because I have one.
    One thing, slug your bore. Mine had a .268 bore.
    I had mine rebarreled with a .264 bore and works MUCH better.
    Enjoy it, Timney also makes a replacement trigger/safety that is a heck of a lot better than the stock Arisaka safety.

  7. #7
    Boolit Mold
    Join Date
    Dec 2008
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    3
    Thanks guys, I do have a set of RCBS 6.5X257 dies. The rifle was my uncles, we grew up together, to me he was like a brother, after he passed his son dropped off a couple of his rifles he thought I might like, one of them was the sporterized Arisaka, with some ammo and dies. Not being familiar with that caliber, I figured I'd best get some info on how to form the brass. So thanks for all the help.

  8. #8
    Boolit Master Idaho Mule's Avatar
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    Jun 2012
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    You can fire form your 257 brass and then you have what you need. You can also neck down 7 x 57 or 8 x 57 brass with your RCBS dies. If using 7x57 brass the shoulder will have to be blown forward by fire forming with your first load, the 8x57 will come out just right. Several years ago I had a 26" Shilen barrel chambered to 6.5x 57 Mauser and installed in a 98 action. The rifle is a bit too heavy for a "packing around" gun, but I am saving it for when I get old and want to just sit in one place and snipe. I did hunt with it one fall and killed my 2 white tail deer and cow elk using Hornady 129 gr. bullets, it works well but has been waiting patiently in the safe since. I am not sure how strong your Jap action is, but I would think loads from Hornady book for 6.5 x 57 should be fine for you. JW

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check