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cartridges from different manufacturers with same weight?

Discussion in 'The 10 Ring' started by novasquid, May 11, 2012.

  1. novasquid


    Dec 13, 2011
    i have 180gr jhp's from underwood and bvac. i pulled out my kitchen scale, which can measure in grams, and weighed each round. they each weigh 17 grams consistently.

    since each cartridge weighs 17 grams, is it safe to assume that the bvac will have the same power as the underwood? i'm guessing no, because there are other factors to consider, e.g. bullet type, powder quality, etc.
  2. Jitterbug


    Aug 27, 2002
    It might, but I doubt it, too many weight variables in the other components. A gram = 15.4 grains, I seriously doubt a "kitchen" scale would be an adequate measure.

    I've tried to weigh loaded cartridges on a reloading scale to determine if I'd goofed on my powder charge, it's an exercise in frustration, requiring one to carefully "pull" the bullet and then weigh the charge.

    And even then a side by side comparison is not a valid method of determining the powder...might lend some insight, but that's about it.

    Some powders such as 800x are unique in appearance, but one needs to be very careful and not assume anything about powder.
    Last edited: May 11, 2012

  3. dm1906

    dm1906 Retired SO

    Sep 7, 2010
    PRK (Kalifornia)
    A difference of one gram is HUGE. You must measure in grains. An increase of 1/2 grain of powder can mean the difference between an acceptable load and a KB. Bullet weight isn't as critical, but one gram, or 15 grains, will cause a competent loader to adjust their recipe or discard the bullets. Include into that equation the weight inconsistency with same-lot brass, and it becomes more vague. There are too many factors involved to assume the same weight cartridges are of the same construction, or performance.
  4. countrygun


    Mar 9, 2012

    or a squib, or "really bad stuff".

    Actually, that fact that they DO weight the same almost indicates it's a pure coincidence. Even relative humidity in different loading locations would almost assure some variance. Bouble check your scale just to be on the safe side.
  5. WeeWilly


    Nov 12, 2011
    Short answer, no.

    It really isn't a powder "quality" kind of thing. Two different powders of equal "quality" will have completely different burn characteristics, personalities really.

    As far as telling anything from a group of loaded handgun rounds by weighing them, I can't even find a round I forgot to put powder in by weighing each of them. The other component's variables are too large.