rcbs uniflow question


January 5, 2009, 11:42 PM
just picked up a uniflow powder dispenser at an estate sale...cheap enough so why not.
heres my question.

how do you set it up to throw a charge. it seems when the adjustment screw is all the way in (throwing a minimum charge), the numbers on the screw read 10 however, when all the way out (maximum charge) it reads 1.
perhaps i am taking the numbers the wrong way, and they are just a point of reference....
there was no manual with it, just don't wanna waste powder or mess anything up.


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January 5, 2009, 11:51 PM
They're just a point of reference.

January 5, 2009, 11:59 PM
excellent. thanks!!!!!!

January 6, 2009, 06:27 AM
They used to come with two rotors, one mostly for rifle charges with a big hole in it, the other mostly for pistol with a small hole in it. I just use the rifle rotor for everything.


January 6, 2009, 06:29 AM
That is backwards to mine. However mine is fairly new, a couple of years old. You should not rely on the numbers anyway to set a charge, always check the weight of the throw to make sure. They will however get you close and you can fine tune it from there.

January 6, 2009, 07:44 AM
I disregard the numbers, as it's pretty easy to zero in on a charge without them. Even if I leave it alone, I notice changes due to ambient temperature and have to readjust from one day to another.

I reload 9mm rounds and found the variance too great with the larger assembly. I bought the small one (the large came with the rock chucker kit I bought) and the charges became much more consistent.

Finally, I added the baffle and the loads became even more consistent, and variance virtually vanished. I still weigh close to 1 in 5 charges, but that is my thing.

January 6, 2009, 09:11 AM
I disregard the numbers, and also use the rifle drum for everything as well. Just screw, dump, measure, repeat, until the scale says stop.

Edited to add...
Ya know, if you didn't know what I was talking about, that sounds pretty obscene.

January 6, 2009, 12:01 PM
I have a Uniflow measure that I have been using for 25 years. The first thing I noted about those numbers on the screw were that they are only a reference point. For the most part I pay little or no attention to them anymore. I just eyeball the adjustment and then check the charge with my scale. Then adjust the screw as needed to get it spot on. Takes just a couple of minutes then I am ready to start loading.


January 6, 2009, 12:27 PM
Yep, the numbers are only there so you can make a note to yourself and get back close to it a year later.

NuJudge is correct, the complete set came with a large and small bore rotor. Seems to me the small bore (pistol) was about 3/8 inch, while the large bore (rifle) was more on the order of 3/4 inch.

The complete unit also had several (2-3) plastic adapters that screwed into the bottom to help the powder go into different size case mouths. You can still but all these bits as accessories from RCBS.

About the only concern you ever here about a UniFlow was slightly different flows at different powder levels, which is easily fixed with some beer can shaped into a diffuser. This would be similar to what you see inside a Dillon powder measure.

Congrats on a great find. I still use mine and they do work great.

January 6, 2009, 01:28 PM
The text of my comments when adjusting a Uniflow must be censored.

"Just a c*** hair more"

Mal H
January 6, 2009, 02:33 PM
Weird! I've been using a Uniflow for a looong time (decades). I had to go take a look at it. Honestly, I never even knew there were numbers on it! (That's due to a combination of not needing the numbers and bad eyes. ;) )

January 6, 2009, 03:33 PM
Just a hint that everybody may already use is when you go to set a charge for the first time, weigh the powder first to whatever you want, then dump that into the hopper on the measure and turn the crank a half a turn, with the powder trapped in the cavity of the drum then turn the stem till you can tell you are against the powder.
Gets you real close real fast.

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