Hello Fellow SigForum reloaders. Do any of you have and data that shows what MEC charge bushings drops are for the Winchester WST powder? The chart MEC has online does not specify WST. They show a charge for Winchester Super Target, however that is not the same. Any help is greatly appreciated.

Here is the link to the information on Hodgdon's website.

https://hodgdonpowderco.com/wp...oads/2023/09/mec.pdf

Perfect! Thank You topherh! I didn't realize Hodgdon had their own chart!

I would not rely on any of those charts because they are typically "off" a bit in some direction. If you want to know the weight of the charge you are throwing then use a scale.

quote:

Originally posted by Scooter123:
I would not rely on any of those charts because they are typically "off" a bit in some direction. If you want to know the weight of the charge you are throwing then use a scale.

I will once I get the bushings. I did find that for the bushing I do have, Hodgdon's chart is off. My WST is weighing in at the weight in the column (800-X)to the left. So the 800-X column is what I based the bushing size I would need.

One thing you need to be aware of that the MEC single stage presses all produce a lot of variation in the thrown charge weight. It's because MEC parks the powder bushing under the powder bottle while you are stroking that press for the De-Prime/Size, for the powder insertion, and the pre-crimp and the crimp. All that action means that additional powder will get packed into the bushing by the vibration for those strokes and it will vary with each shell depending on the vibration produced. For example a stick primer can add an addition full grain of powder to that particular shell. For a powder like Unique, Clays, or Longshot the Standard Deviation for thrown charges is a whopping 0.42 grains so the 6 sigma range is +/- 1.26 grains.

Note, there is a fix for this issue. One the Sizemaster and 600 series presses there is a black stamped part mounted to the charge bar that MEC calls the Prochek. All you have to do is notch the Procheck so that it will allow the charge bar to be shifted to the left by one bushing diameter. Then while operating the press after dropping the shot charge, which also fills the powder bushing, you shift the charge bar to the left as soon as the press is at it's upward position. This results in the powder charge being isolated form vibration during all those following stages. It also takes the SD from 0.42 grains to 0.17 grains with the above listed powders. Take a look at the images below and look closely at the Prochek and it's new notch that allows a new Park position for the powder charge. Then look at the modification between original and modified.

Wow can't believe I missed this post. That's some good information Scooter123. I am loading on the low recoil end and for what I am using them for I'm not to worried about slight variances. You've been a tremendous bank of knowledge on this. Thank you!