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velosity variance in handgun ?

Discussion in 'Handloading and Reloading' started by joneb, Mar 14, 2012.

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  1. joneb

    joneb Member

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    So when chronograghing handgun loads do you concern yourself with case weight variations in the brass ?
    I am trimming down some 9x19 S&B to 9x18 and I'm noticing a variance in case weight, since the external dimensions are the same I can only assume the internal dimensions are not.
    Those with chronograghs seem to be concerned with SDs and ESs but are they concerned with case weight variations in the brass ?
    Thanks
    How did I spell velocity wrong :confused:
     
    Last edited: Mar 14, 2012
  2. rfwobbly

    rfwobbly Member

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    I don't. If you need a consistent load, then using the same brand brass throughout a batch is all you usually need to do. They'll always be some variation, but the greatest is going to be in mixed brass.
     
  3. joneb

    joneb Member

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    Thanks rfwobbly,
    I am trying out a new pistol powder and I am considering variables, whats next ? you guessed it I'll be weighing my primers :scrutiny:
     
  4. 1SOW

    1SOW Member

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    :D

    Fed SPPs will give a slightly higher avg speed than others. SPP Magnums will give slightly higher yet. The speed increase will vary some depending on the powder.
     
  5. Walkalong

    Walkalong Moderator

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    9MM brass varies wildly in wall thickness and weight. Sorting could only help, but could you could see it on target?

    Powders make a difference in ES & SD numbers. Sure do. So does the pressure level.
     
  6. GLOOB

    GLOOB Member

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    Differentiating your 9x18 from 9x19 causes enough grief, as it is. If you're gonna spend the time to cut down mak brass, the least you can do is settle on one headstamp. Preferably a headstamp with sharp lettering that holds red Sharpie, well.
     
  7. rcmodel

    rcmodel Member in memoriam

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    +1

    Sort the cases by headstamp.

    Not only are internal differences going to change case capacity.
    But web thickness is gonna change seating and crimping requirements/.

    BTW: I hope you pick them all up when you shoot them.
    It is a real PITA to find a bunch of cut-off 9mm in your 9mm brass!!

    rc
     
  8. joneb

    joneb Member

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    I do my best, but I am lucky to recover 90%.
    I traded/sold my G/17 and G/19 so I just have the East German Makarov now. The 9x19 brass I have is free range brass, the FC and S&B seems to be the thickest at the case mouth more so than GFL,RP,Win and PMC. I have 300ct of Sierra bullets I got cheep on close out they are .363" dia and my groove diameter for this pistol is .365" I loaded 50 with various charges of W231 and AA#5 in 9x18 brass with poor accuracy, my gut is telling these bullets are to small and then I thought maybe poor neck tension. I have RCBS carbide dies so I acquired another expander/flare stem I can turn down or I can use thicker brass, so I'm going to try the trimmed 9x19 S&B brass and see how that works.

    I am seeing a case weight variance of 2gr so I will sort it for testing. I am curious if anyone has found a velocity difference with 9x19 because of a 2gr difference in case weight ? Maybe I'm over analizing this :confused:
     
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