Quantcast
  1. Sign up now and join over 35,000 northwest gun owners. It's quick, easy, and 100% free!

Rifling grooves in Bullets-how deep?

Discussion in 'Ammunition & Reloading' started by jdub75, Feb 2, 2010.

  1. jdub75

    jdub75 PNW Well-Known Member

    Messages:
    1,036
    Likes Received:
    63
    I was out shooting over the weekend, and retrieved some of my bullets. I found a few of my expensive HP's, and rifling from the barrel (A S&W M&P in .40 s&w) is just visible.
    However, the FMJ bullets (Blazer Brass) bullets have the copper casing cut all the way down to the lead from the rifling.
    Is this normal, or is this the trademark of a cheap bullet? Anything to be concerned about?

    FYI,
    my pistol is very new ca: about 100 rounds thru it so far.

    Thank you,
    JDUB
     
  2. Gunner3456

    Gunner3456 Salem Well-Known Member

    Messages:
    5,108
    Likes Received:
    834
    I would be measuring some bullets there from my unfired stash. They should be .400 thousandths, or .40 inch IIRC.
     
  3. BuckLoner

    BuckLoner Ohio New Member

    Messages:
    4
    Likes Received:
    0
    Gunner has given youa great place to start.
    Many times over the years I have re-loaded ammunition for my .44mag using bullets that differ in diameter from one manufacturerer to another, Bullet styles also differ. The differences in diameter are slight but, that slight difference can have a great affect on accuracy etc.
    Goto a website like midwayusa.com and look at the bullets they offer for reloading.
    Have you noticed if your handgun shoots better using one brand over the other ? When it's all said and done, that is what counts.
     
  4. Gunner3456

    Gunner3456 Salem Well-Known Member

    Messages:
    5,108
    Likes Received:
    834
    I would guess that the cheap Blazer Brass bullets are way over sized and have stretched the bore diameter of your gun. :laugh: :laugh: :laugh: :thumbup:

    Naw, but I have seen defectively sized bullets even in the best of brands. I've seen a lot more in the cheaper brands. It's rare, but I've seen it.

    What brand are those "expensive HP's" just out of curiosity?

    PS Harbor Freight has the digital calipers on sale again right now for $9.95.
     
  5. jdub75

    jdub75 PNW Well-Known Member

    Messages:
    1,036
    Likes Received:
    63
    Thanks for the tip on the calipers...was just thinking: GREAT. Another accessory to my already insanely expensive hobby! I can deal w/ $9.95.

    The HP's are Federal Hydra Shocks.

    And yes, my M&P Compact does NOT like the cheap Federal Red box stuff from WalMart (but the full size one doesn't seem to care?). I get FTF about 20-30% of the time. But its fine w/ Blazer Brass, my HP's and PMC cheap stuff.

    Thanks guys.
     
  6. jdub75

    jdub75 PNW Well-Known Member

    Messages:
    1,036
    Likes Received:
    63
     
  7. jsharp1

    jsharp1 Hillsboro New Member

    Messages:
    22
    Likes Received:
    0
    jdub your blaser bullets may be electroplated which is a much thinner jacket compared to a normal bullet jacket,hence the reason for cutting through to the lead core.Just my $.02 worth.
     
  8. jsharp1

    jsharp1 Hillsboro New Member

    Messages:
    22
    Likes Received:
    0
    Groove diameters sometimes vary.You can check that by driving a soft lead slug through the barrel and measure the slug with a micrometer.If you don't feel comfortable doing it yourself any good smith can do it for you.
     
    Last edited: Mar 2, 2010
  9. Partsproduction

    Partsproduction Tillamook Oregon Active Member

    Messages:
    824
    Likes Received:
    187
    Huh? .040" is less than 1/16" inch. You were correct just writing .40" which is exactly the same as .400".
     
  10. Gunner3456

    Gunner3456 Salem Well-Known Member

    Messages:
    5,108
    Likes Received:
    834
    Oops, my bad. Should have looked at that twice. Thanks. :thumbup:
     
  11. jsharp1

    jsharp1 Hillsboro New Member

    Messages:
    22
    Likes Received:
    0
    Gentlemen,fyi rifling depth varies from .002 to .005.The average being about
    .004.That's four thousandths not 40 thousandths.
     
  12. Gunner3456

    Gunner3456 Salem Well-Known Member

    Messages:
    5,108
    Likes Received:
    834
    We've been discussing the diameter of a .40 cal bullet, not rifling depth.
     
  13. jsharp1

    jsharp1 Hillsboro New Member

    Messages:
    22
    Likes Received:
    0
    Sorry my mistake.
     
  14. Gunner3456

    Gunner3456 Salem Well-Known Member

    Messages:
    5,108
    Likes Received:
    834
    That's OK. I made a typo and said that a .40 (.400 thousandths) bullet was .040 thick. so we're even. :laugh: