PMA Tool

PMA Micro Die Adjuster w/ Thumb Screw Upgrade

(49 reviews) Write a Review
  • PMA Micro Die Adjuster w/ Thumb Screw Upgrade
  • PMA Micro Die Adjuster w/ Thumb Screw Upgrade
  • PMA Micro Die Adjuster w/ Thumb Screw Upgrade


For as long as we've been reloading we've always hated setting up our full length sizing dies. We've been using shims to help this along for quite a long while now, but have not really been pleased with them. It seems we always misplace them, or can't find the ones we need, or grab the wrong ones, and they always seem to be covered in rust. For as many years as we've been doing this we've always been looking for a better way. After searching off and on for a solution to this nagging problem we finally have a workable solution. The PMA Micro Die Adjuster.


The PMA Tool Micro Die Adjuster (MDA) replaces your existing lock ring and can be used with nearly any 7/8-14 full length sizing die. We successfully used this tool with sizing dies from Redding, RCBS, Hornady, Lee, Harrells Precision and those made from Newlon Precision die blanks. It allows you to easily make adjustments to your “shoulder bump” as fine as .0005”. The engraved marks on the MDA are equal to approximately .001” (true adjustment .000992”) of adjustment to the shoulder bump. Splitting the engraved marks is therefore approximately equal to .0005”. The design of the MDA does not allow it to work with the Forster Co-Ax press and is not intended for use with turret presses, progressive presses or the RCBS Summit press. Some custom dies for very short cartridges may require the use of an extended shellholder.Micro Die Adjuster shown in use installed on Custom Newlon/Scott 6mm PPC Die and Harrells Precision Compact Press.

**Includes Thumb Screw Upgrade for locking the adjustment in place

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49 Reviews

  • 5

    PMA Micro Die Adjuster

    Posted by JT on 9th Apr 2024

    Great Quality! Product functions as advertised.

  • 5


    Posted by Bob on 2nd Apr 2024

    Works as it should. Once you get it close to size it is very accurate in the measurement and is also repeatable. Best idea I have seen to make fine adjustments when sizing cases. If you have 2 calibers you want to use this on, just buy 2. Don’t try to switch between calibers. It works perfect on both my rcbs and Redding type s bushing dies.

  • 5

    Micro die adjust

    Posted by Scott Summers on 11th Mar 2024

    Excellent this is my 3rd 1. Wish I had 1 on all my dies

  • 5

    Micro adjuster

    Posted by Frankie Crum on 26th Feb 2024

    Very nice setup for that "just right" brass bump back! This does an excellent job and is very consistent. Can't be beat!

  • 5

    PMA Micro DieSdjuster

    Posted by Dennis Y on 22nd Jan 2024

    Excellent, this is my second one. Great for getting headspace exactly and the repeatability is unbelievable. GREAT PRODUCT!!!’nnnn

  • 5

    easy to instal and use

    Posted by pete on 21st Dec 2023

    When used with full-body necking dies it helps to better align case-neck centers and provides more consistent shoulder setbacks.

  • 3

    It's a good idea...but.

    Posted by Rand on 30th Sep 2022

    It's works but I took a long time to clean the threads so that it would work. The threads were machined with lots of metal fragments and dirt left. Impossible to adjust until it was cleaned and buffed. Hours lost. But once it was corrected it works fine.

  • 5

    Micro die adjuster

    Posted by ERnie Broe on 27th Aug 2022

    I saw it in use by a friend who is a national champion. I intend to use it for my 6PPC die for precise bullet seating.

  • 5

    Micro die adjuster

    Posted by Larry Boers on 14th Jul 2022

    I have been using one for years for my short range benchrest shooting. I got a zen one one now for my long range shooting kit because it makes changes so easy and it’s very accurate and repeatable.

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