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Thread: Questions on 7mm case heads

  1. #21
    Boolit Master
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    Somewhere I read if the shell holder for 7x57 won't work try the shell holder for 220 Swift sorry don't know the number for the Swift.

  2. #22
    Boolit Master 44magLeo's Avatar
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    I have had the same issue with 7x57. Not with one brand but with different brands. European brass for the 7x57 is made to CIP specs. When American manufacturrs syarted making 7x57 they made them the same as 30-06 brass.
    For some of my brass I use a 6.5x55 shell holder, some the 30-06 shell holder.
    CIP calls for a slightly larger diameter in the bottom of the extractor groove and slightly larger rim.
    All work in the rifle. just some are too tight for the US shell holder.
    You sometimes find the same with 308 brass, some fit the same as the 06, some son't.
    Leo

  3. #23
    Boolit Buddy
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    Quote Originally Posted by Bad Ass Wallace View Post
    Not unusual, take 6,5x55 - Norma cases only fit an RCBS No.2 while PMC & Win require a No.3. The difference Norma rims measure 0.476" while Win are 0.472".
    Sounds like the Norma is made to spec.

  4. #24
    Boolit Master
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    Ain't no thing and it isn't uncommon with a great number of cartridges. I have a few that I keep 2 shellholders in the die box.. Do what toot or broomhandle said and problem solved. It is reloading and nothing is 100%. We either learn to solve little problems or not.
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  5. #25
    Banned
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    I have experienced the exact same problem with different makes of 7 x 57 casings. The biggest variation of rim thickness and extractor groove profiles were between American made brass and European brass. The solution was a second shell holder and the problem was solved.

  6. #26
    Boolit Master Handloader109's Avatar
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    Thanks guys. I'll see if I can find correct holder, just seemed strange I had hornady brass that was different from other hornady brass

    Sent from my SM-G892A using Tapatalk

  7. #27
    Boolit Grand Master

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    Call Hornaday and let them know.
    Wayne the Shrink

    There is no 'right' that requires me to work for you or you to work for me!

  8. #28
    Boolit Buddy
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    The shell holder for the older 257 Roberts brass should work. I don't remember the number.

  9. #29
    Boolit Master

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    Have the same issue with ‘USA’ headstamp brass I load for an AMT.
    On average one out of 15 won’t fit into my Lee Auto Bench Prime shell holder.
    Those go in scrap pail. Load the rest, go shooting. Next time I’m reloading I have the same issue with the remaining USA HS brass. I Have roughly 200 pcs USA HS brass and well over 4,000 other HS’s in this caliber. I know every piece of this USA brass has cycled through my reloading process several times and each time the pieces that won’t fit the Lee shell holder are scrapped. But each session I find some more. All I can figure is that upon firing or resizing the extractor groove gets narrower and the case binds on the shell holder.
    This isn’t a hot load, the effort to resize is the same as all the other brass and none of the other Headstamps I load in this caliber ever fail to fit the shellholder during their usable life. I don’t care that I scrap several USA HS brass each session, it doesn’t own me anything. Just one of life’s mysteries I guess.

  10. #30
    Boolit Buddy
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    Mauser cartridges were designed in Europe, not the US and were not derived from .30-06. Brass produced in Eutope tends to be made to original design dimensions. There seems to be a tendency for US companies to fudge case diameters toward .30-06 while they don't even make .30-06 cases to SAAMI specs. In fact most US-made cases seem to be smaller than spec.
    I learned this

    When making .338-06 cases. Badly bulged cases prompted me to mic all the brands os .30-06 brass I had. The largest base diameter I found was arsenal brass at .467"/.468"while some US commercial brass was as small as .464"/.465". PPU is .468". I recently encountered this with .303 Btit cases also. Rem/Win .303 cases are .450"/.451" ahead of the rim with spec being more like .457". PPU .303 brass is right at spec while Norma is slightly smaller.
    These discrepancies can sometimes help when making cases for obsolete cartridges but otherwise I guess we just live with it.

  11. #31
    Boolit Master Handloader109's Avatar
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    Quote Originally Posted by Deadeye Bly View Post
    The shell holder for the older 257 Roberts brass should work. I don't remember the number.
    Yep,just ran into the correct (I guess) holder a #10. researching neck turning,.

    Sent from my SM-G892A using Tapatalk

  12. #32
    Boolit Buddy
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    I had some Hanson brand Ammo from back in the 80's/90's that had different grooves than the R-P 7mm Mauser Brass I was used too. I had one Mauser that didn't like to feed that ammo. I can't remember if I needed a different shellholder, but have generally found LEE to have the most tolerance (loosest fit).

    Why are you neck turning 7x57 brass? I have never done this. My Mauser loads shot well. I don't shoot cast in mine however. Usually Hornady 139gr BTSP.

    JW

  13. #33
    Boolit Master Handloader109's Avatar
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    Hard to find brass, I'm headed down conversion route, 30-06 or 270 to 7mm Mauser. I expect to have to turn the converted neck...

    Sent from my SM-G892A using Tapatalk

  14. #34
    Boolit Master Handloader109's Avatar
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    A #10 lee fits this hornady brass perfectly...

    Sent from my SM-G892A using Tapatalk

  15. #35
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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