RCBS Uniflow suggestions

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corney

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I have a uniflow that I bought used that I can't make work for me. I read the crappy manual on RCBS site and it didn't help.

This came with a small and large adjustment setup (I don't know what it is called) and I am trying to meter 71 grains of IMR 4350.

Any suggestions?

thanks

corney
 
Uniflow

4350 does not work well in a powder measure as the grains are to long and the measure cutting through them produces inconsistent charges. 4320 works well as do other powders with shorter grains.
 
Last edited:
Why not? said:
And, what is the problem?

Ted
Click to expand...

The problem is its inconsistant and choppy. I don't know which setup I should use. I have Lee and have never had this problem and I could use some advise to make this thing work.

It seems everyone says that it is a reasonable powder drop and I haven't found it that effective.

thanks
 
I own several Uniflows and can testify they do not work well with extruded ('stick') powders. Switch to a 'ball' powder and you will be a happy camper.
 
...RCBS Uniflow measure...

...the only extruded powder that will work in mine is 4227...all other ball powders work fine...for other extruded powders I use a Lee Perfect measure...
 
I think the Lee works for you with 4350 because it has a plastic meter/chamber that can conform to the powder charge as opposed to the cutting action of ALL metal ones. The RCBS, Hornady, Forster and Redding all do what you are describing with longer grain extruded powders and are kind of designed to. Nothing broken, just a fact of life. If the Lee works for you, stick with it. Many of us have multiple throwers for different powders and I bet if you try a ball powder or the short kernel version of 4350 you may prefer the Uniflow over the Lee. My Uniflow throws charges of Benchmark that defy measurement for deviation. Don't give up on that RCBS - it's a good product. One thing I can recommend though is to use the strongest or sturdiest mount for the measure you can - mount it into your press if you have to as it will reduce the "clunk" and springy overtravel you get when cutting those long kernels.
 
The tricks with metering long grain powders are; develope a uniform stroke regardless of whether or not a granual feels like it is geting cut, keep a uniform level in the hopper...about the middle third, and be patient. It's a bit of a learning/feel curve with all steel measures.
If this fails keep the RCBS for sc, ssc, and ball powders and use the Lee for long grain extruded powders where it works flaulessly. The Lee might gum up a bit with some ball powders, but again it's something that one can learn to live with given a bit of patience.
 
Quote: "Or you can throw your charges slightly under and trickle the rest in."

I throw at about the right setting and then weigh, pinching a litlle powder on or off the scale as required.

Only ball powder will throw accratley. Once you start the stroke, don't back up and take another run at cutting the kernal., This will increase the charge.
 
So I attacked this powder measure without prejudice and it still fed up and down!

I gathered this is the wrong powder for this drop. I cut grains of powder every third drop or so.

I will not give up but after making almost 50 .338 beauties with it I can say next time I'm going back to the Lee cheapy.

The Rock chucker is simply marvelous compared to the cheap Lee press I had before.

I DESERVED IT DARN IT!

corney
 
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