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Bushing Neck Sizer Die Help/Advice!?!

Discussion in 'Handloading and Reloading' started by accur8, Nov 1, 2013.

  1. accur8

    accur8 Active Member

    Figured I'd venture into the bushing realm.

    Which way is best to determine bushing sizes? I'm aware of the 2 most common and was also wondering that if I went with the neck wall thickness method, if the thickness is measured after I turn the neck. Logically I am thinking yes, but want to be certain.

    My other questions are:

    Which method is best or most accurate?

    How many bushing should I start with at what increments?

    Thanks in advance.

  2. USSR

    USSR Well-Known Member


    Here is how I do it: Load a cartridge using the brass you intend to use and then measure the neck diameter with the bullet seated in the neck. Fire the cartridge and then measure the neck diameter of the fired case. If the difference between the fired case neck diameter and the loaded case neck diameter is greater than .005", then plan on buying an intermediate size bushing and resizing the neck in two steps. For example: Your loaded brass neck measures .336" and your fired brass neck measures .344". Plan on using a .340" bushing followed by a .336" bushing. The reason for this is, once you get above .005" in the amount of resizing you have to do, the bushing will size a little more than it is supposed to. On the other hand, you can just get a .337" bushing and hopefully you will end up with .336" necks. Hope this helps.

  3. Offfhand

    Offfhand Well-Known Member

    Very simple. If you turn your case necks just measure the wall thickness after turning. Double that measurement and add to bullet diameter. Use bushing die .002" smaller than total. Or, simply (Nw X 2 + Bd - .002") You may wish to experiment with other bushing for greater or lesser seating pressure but just one bushing will get you started. Generally speaking, it takes an extra accurate rifle (Benchrest) to see any accuracy improvement by fine tuning bullet tension.
  4. ranger335v

    ranger335v Well-Known Member

    "Bushing Neck Sizer Die Help/Advice!?! "

    I would advise not getting a bushing sizer until you have enough experience to know what you're doing.
  5. USSR

    USSR Well-Known Member

    True. If you cannot use a set of calipers, stay away from bushing dies.

  6. accur8

    accur8 Active Member

    I thought I was somewhat experienced at reloading with the exception of using bushing sizers. I loaded tens of thousands of rounds in calibers ranging from 357 Sig to .338 Lapua. I weight sort my brass, bullets, turn the necks on all bolt action cartridges, annealed cartridges, have done numerous cartridge conversions, and so on. I just have never used a bushing neck sizer. I also needed something new to experiment with.

    Thanks to all for the input and advice.
  7. lightman

    lightman Well-Known Member

    I would turn the necks, load a bullet, and measure the diameter. Sometimes the math just does not work out when measuring the wall thickness, multiplying by 2 and adding bullet diameter. I'm not sure why, maybe an accumulation of errors, or something. Measuring the loaded round is easier for me. Lightman
  8. accur8

    accur8 Active Member

    Thanks lightman, I'll be busy doing all kinds of tinkering for awhile, I'm sure
  9. Walkalong

    Walkalong Moderator

    Yep, it's best to measure a loaded round. It may not matter with a factory chamber, but for a tight necked chamber if you are cutting it close (.001 or less clearance), measuring an actual loaded round is the only way to be safe.

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