RepackboxLee PrecisionADvertise hereMidSouth Shooters Supply
Inline FabricationTitan ReloadingRotoMetals2Wideners

Results 1 to 13 of 13

Thread: Help please?

  1. #1
    Boolit Buddy
    Join Date
    Aug 2006
    Location
    NorthEast Indiana
    Posts
    322

    Help please?

    I have need to know ACTUAL diameter of currently produced unfired 8mm Mauser or .30-06 cases as measured just ahead of the extractor groove. What I'm after is (without having to buy brass just to find out) which brand as currently produced has the smallest ACTUAL diameter

  2. #2
    AKA: GRMPS Conditor22's Avatar
    Join Date
    Dec 2018
    Posts
    1,299
    I convert military 30-06 in 8MM (8x57) and they work fine
    ACTUAL 8mm SIZED AND LOADED .4685
    military 06 CONVERSION SIZED AND LOADED .4675 LC 69

  3. #3
    Boolit Bub Blackhawk357's Avatar
    Join Date
    Mar 2016
    Location
    Northwest FL
    Posts
    53
    According to Sierra....

    Sent from my SM-G950U using Tapatalk

  4. #4
    Boolit Master Bazoo's Avatar
    Join Date
    Dec 2013
    Location
    Cecilia, Kentucky
    Posts
    2,940
    Well, you could take your calipers to the local academy or similar and measure some.

    I measured some 30-06 winchester above the rim and it measured .4645 across 3 cartridges. All the factory ammo I have for that caliber.

  5. #5
    Boolit Mold
    Join Date
    Sep 2019
    Posts
    12
    [QUOTE=Bazoo;4747404

    I measured some 30-06 winchester above the rim and it measured .4645 across 3 cartridges. All the factory ammo I have for that caliber.[/QUOTE]

    Thank you. Exactly the kind of info I am looking for.

    I know what the specs are but no 06 brass I have is as large as specs. However all 06 brass I have is at least 25 yrs old. The only 8mm brass I have is .4675 in front of extractor groove. It is PPU.

  6. #6
    Boolit Master
    Join Date
    Sep 2017
    Posts
    701
    8mm Mauser is a tricky one - there are two that are similar. But one is rimmed and the other is not.
    The JS is not rimmed, the IRS is:
    Click image for larger version. 

Name:	8mm_Mauser.jpg 
Views:	46 
Size:	53.1 KB 
ID:	249981
    WWG1WGA

  7. #7
    Boolit Master
    Join Date
    Apr 2006
    Location
    East TN
    Posts
    891
    I suspect you could create smaller base 8mm brass from 30'06 by first sizing your brass in a 30'06 small base sizing die. Expand the neck with a tapered neck expander, then size with a conventional 8mm Mauser sizing die to establish the shoulder. Trim, chamfer and load. Worth a try at least.

  8. #8
    Boolit Mold
    Join Date
    Sep 2019
    Posts
    12
    Thanks for the responses.

    One response was helpful: "I measured som .30-06 Winchester..." This what I had hoped for re: different brands. I know all about 8x57 J, Js, JRS (who has 8x57 rimmed); I wrote 8mm Mauser because that is the headstamp...

    I need to buy 8x57, 8mm Mauser, brass from which to form cases in a small base die and would like start with the smallest diameter cases that are readily available. Experimenting, I have formed cases from
    8mm brass that measured .467" and it worked tho I lost some. Smaller dia. would be easier. If need be I can and will use 06 cases but 8mm simplifies the process. I could go to a store and measure cases but do not know where to find 8mm brass in stock locally. That is why I asked here.

    I know what PPU 8mm brass measures. I had hoped someone might have some Win/Rem/Hornady they might quickly measure?

  9. #9
    Boolit Master
    Join Date
    Sep 2017
    Posts
    701
    I measured one. It is a PPU 8mm Mauser Match 200 grain bullet. Here are the stats:
    Neck: 0.347
    Neck end: 0.347
    Shoulder: 0.433
    Base: 0.468
    Case Length: 2.235
    OAL: 3.170

    Click image for larger version. 

Name:	8mm_PPU_Mauser.jpg 
Views:	7 
Size:	38.7 KB 
ID:	250073

    EDIT: Missed that you know what PPU measures... But will leave the post for others.
    WWG1WGA

  10. #10
    Boolit Mold
    Join Date
    Sep 2019
    Posts
    12
    Quote Originally Posted by 44Blam View Post
    I measured one. It is a PPU 8mm Mauser Match 200 grain bullet. Here are the stats:
    Neck: 0.347
    Neck end: 0.347
    Shoulder: 0.433
    Base: 0.468
    Case Length: 2.235
    OAL: 3.170

    Click image for larger version. 

Name:	8mm_PPU_Mauser.jpg 
Views:	7 
Size:	38.7 KB 
ID:	250073

    EDIT: Missed that you know what PPU measures... But will leave the post for others.
    Thank you. I have made a few cases from 8mm PPU but would prefer a smaller base if possible.

  11. #11
    Boolit Buddy

    oconeedan's Avatar
    Join Date
    Jan 2019
    Location
    Lake Oconee Ga
    Posts
    124
    I'm curious, what are you forming cases for? Some brass, has thicker walls and this may be the factor that determines ease of forming.

  12. #12
    Boolit Buddy


    Join Date
    Mar 2015
    Posts
    220
    I don't have a Sierra manual, but in the Lyman 50th Edition it says the dimensions are max and if your reloaded ammo brass is at or over this measurement they will likely not chamber in most firearms. I had a 22-250 case stick in my rifle the other day. After I got it out I checked it and it was .005 over the measurement in my Lyman manual. It also says the measurements are max and cases shouldn't be at or over these measurements in most guns. I don't know if it is the same with the Sierra manual but I thought it may help to know this info.

  13. #13
    Boolit Mold
    Join Date
    Sep 2019
    Posts
    12
    I have learned to use specified diameters for mostly for reference.
    Thirty + years ago I was developing loads for a .338-06and encountered a problem with brass bulging excessively. The problem turned out to be mostly due to a chamber that was wallowed oversize. In tracking down the problem I started measuring base diameter of various makes of .30-06 brass.., LC, Ww, R-P, Federal. I do not recall all dimensions but I do recall the largest being LC at .467 and the smallest being WW at .464. Not one even close to spec.
    In reloading for factory rifles normally there would be no reason to be concerned about case diameters. It is when you get off the beaten path (or encounter a really tight chamber) that it pays to know what you are dealing with. In this case I need to form cases using what amounts to a "snug" small base die meaning that finding new brass with the smallest diameter will greatly reduce time and effort in forming cases. Not to mention expense should I buy a quantity of brass only to find it unusable.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
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