Inline FabricationRepackboxRotoMetals2MidSouth Shooters Supply
Titan ReloadingReloading UKLee PrecisionADvertise here

Page 2 of 2 FirstFirst 12
Results 21 to 31 of 31

Thread: Are .30 caliber or .308 caliber diameters different

  1. #21
    Boolit Master
    Join Date
    Oct 2013
    Location
    JAX, FL
    Posts
    747
    ...The most annoying is when bullets are called "heads",...
    Asleep at the wheel again I guess, but I have NEVER, EVER herd of bullets being called heads. A link or reference would be appreciated.
    “Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem.” Ronald Reagan


  2. #22
    Boolit Buddy Stewbaby's Avatar
    Join Date
    Aug 2015
    Location
    Pelahatchie, MS
    Posts
    263

    Are .30 caliber or .308 caliber diameters different

    I blame The US military for .30, lol (7.62 was at least used on the m14).




  3. #23
    Boolit Grand Master



    M-Tecs's Avatar
    Join Date
    Apr 2008
    Location
    Minnesota
    Posts
    7,216
    Quote Originally Posted by 1hole View Post
    .30 caliber barrels are normally bored to .300". Normal rifling is cut .004" deep, therefore the full groove diameter of a .30 caliber barrel is .308". All ".30 caliber" bullets are made .308" so they can fill the barrel.

    I know of no manufacturer who makes .300 bullets. If you're measuring .300 bullets in a box of .308/7.62 ammo (or .300 magnum) you're doing something wrong.
    Ihole is correct. There are two diameters in a barrel. The greater (major) diameter is the groove; the lesser (minor) is the bore.

    The groove diameter is what you are checking bullet fit against.

    Good info here https://castboolits.gunloads.com/sho...ter-teminology

    Listing the bore diameter as a Caliber is a carryover from the early days.
    Last edited by M-Tecs; 11-24-2021 at 10:34 PM.
    2nd Amendment of the U.S. Constitution. - "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."

    "Before you argue with someone, ask yourself, is that person even mentally mature enough to grasp the concept of different perspectives? Because if not, there’s absolutely no point."
    – Amber Veal

    "The Highest form of ignorance is when your reject something you don't know anything about".
    - Wayne Dyer

  4. #24
    Boolit Master 15meter's Avatar
    Join Date
    Feb 2017
    Location
    SE Michigan
    Posts
    1,524
    Quote Originally Posted by oley55 View Post
    Asleep at the wheel again I guess, but I have NEVER, EVER herd of bullets being called heads. A link or reference would be appreciated.
    Except for the guys around here that try to sell "stuff" on Craigslist.

    "Heads" for bullets is pretty common.

  5. #25
    Boolit Grand Master



    M-Tecs's Avatar
    Join Date
    Apr 2008
    Location
    Minnesota
    Posts
    7,216
    Quote Originally Posted by Baltimoreed View Post
    No wonder my 300blackout sucks, Ive been swaging .308s down to 300. Then why isn’t it called 308blkout? Reloading is so comfusing, next thing you'll tell me that a .38 special isn’t .38. [wink wink, nod nod] More research is required.
    You set the hook well with some. You missed the purple font.
    2nd Amendment of the U.S. Constitution. - "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."

    "Before you argue with someone, ask yourself, is that person even mentally mature enough to grasp the concept of different perspectives? Because if not, there’s absolutely no point."
    – Amber Veal

    "The Highest form of ignorance is when your reject something you don't know anything about".
    - Wayne Dyer

  6. #26
    Boolit Master Baltimoreed's Avatar
    Join Date
    Dec 2012
    Posts
    883
    The manager of my local bank branch is a shooter/hunter reloader and he calls bullets ‘heads’. Only guy that I’ve ever met that does.

  7. #27
    Boolit Master


    Soundguy's Avatar
    Join Date
    Oct 2016
    Location
    N Central Florida
    Posts
    1,867
    At our local gun store, there are usually a few reloading items..people, during the ammo shortage would try to buy the projectiles and I heard their clerk telling them they were just the heads...

  8. #28
    Boolit Grand Master


    Join Date
    Oct 2009
    Location
    Northern Michigan
    Posts
    6,106
    Heads...pills...bullets...whatever

    If my head hurts, sometimes I take a pill.
    Don Verna

    NRA Endowment Member

  9. #29
    Boolit Master
    Join Date
    Feb 2007
    Location
    South Western NC
    Posts
    3,300
    A "caliber" and correct bullet diameter is determined by the bore size.

    The "caliber" of each named cartridge is wide open to the maker's desire to have a distinction for his ammo in the retail market.
    Thus, off the top of my head for factory .30 caliber cartridges, we have .300 BLK.; .30 Carbine; .300 Savage; .30-30 Win; .308 Win/7.62mm; .30-06 Spring.; .300 Win Mag.; .300 Wby Mag.; .30 Rem; .300 WSM; .300 WSSM; all of them shooting .308" bullets.

    It's even worse for many handgun cartridges. Like, there is nothing about a .38 Special that measures .38". And the supposed deadly 9mm is nothing more than a hot loaded .38 Special with puny, light-for-caliber .356"/.357" bullets.

    All of this only means we need a loading manual for whatever cartridge and bullet weight we want to work with.

  10. #30
    Boolit Grand Master

    Winger Ed.'s Avatar
    Join Date
    May 2007
    Location
    Just outside Gun Barrel City, Texas
    Posts
    5,067
    Quote Originally Posted by 1hole View Post
    It's even worse for many handgun cartridges. Like, there is nothing about a .38 Special that measures .38".

    I think that came from the cap & ball .36 Caliber Navy Colt days that the barrels were .357 inches in dia.

    When cartridges came along, the arms makers only had to do some minimal retooling to make the new guns from the
    equipment they already had for making the .36 cap & ball revolvers & little known .38 rimfire.

    They called them .38s as an advertising gimmick sort of deal so you'd feel like you had more gun the the old .36 C&B was.
    That held, and worked OK for .38S&W, .38 Long, and .38 Special.

    Then along came the .357Mag. It sounded more cool, and would sell better than ".38 Special Extra Long" or something else
    to make the average shopper feel they really had something better than just an extended .38Spec.
    Last edited by Winger Ed.; 11-25-2021 at 06:53 PM.
    Political Correctness and the cancel culture is only allowed to exist because of the coward culture.


    In school: We learn lessons, and are given tests.
    In life: We are given tests, and learn lessons.

  11. #31
    Boolit Buddy
    Join Date
    Nov 2020
    Posts
    107
    Some times after a round has been out for awhile they just change the name like the Remington 244 to the Remington 6 mm or 7 mm express to the Remington 280

Page 2 of 2 FirstFirst 12

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