RCBS Powder Measures - School Me

[d31tc]

I'm no expert - my experience is limited. I have an RCBS Uniflow (newer version from a kit bought around 2019) and I have a Quick Change Powder Measure from the Pro Chucker 5.

Things I think I understand: I believe the quick change metering cylinder is compatible with the Uniflow and Uniflow 2 body. The quick change metering screws are not compatible with the large/small Uniflow metering cylinder. The competition micrometer large/small adjustment screw is compatible with the Uniflow and Uniflow 2 large/small metering cylinder. The Uniflow III is its own animal.

I'm looking to add another powder measure to a tool head on the Pro Chucker 5 dedicated to 9mm. Being value oriented (cheap, frugal could be other words to describe me), I'm searching for a used one. Seems like an old Uniflow is the way to go as I would not be changing the volume frequently but I am confused about the differences in the RCBS Uniflow and Uniflow 2. Are they cross compatible with metering cylinders? What are the differences between the Uniflow and Uniflow 2? What would you consider regarding the RCBS powder measure options on a Pro Chucker progressive?

 

[GW Staar]

When the Uniflow 3's came out RCBS sent me one to review.....so I did. Besides matching pretty well the 4 Uniflows I already had, it has some interesting features. You can read the review here on THR. Then if you still have questions.....fire away.

https://www.thehighroad.org/index.php?threads/uniflow-3-picture-review.871276/#post-11570541

 

[d31tc]

@GW Staar, nice review. I know with small sample sizes, a statistical comparison would be hard to draw a firm conclusion from, but as far as accuracy, are the Uniflows metering pretty much the same level of accuracy? Uniflow vs quick change vs competition vs Uniflow III?

 

[GW Staar]

The reality is, long ago they figured out that hole size in the cylinder made a big difference. That's why small diameter deeper holes metered small charges better than big shallow holes....so they spent a lot of time trying to supply the best mix. Their Little Dandy was made for that reason too. So all three versions...four if you count the second cylinder in the original Uniflow, were attempts to find the best average. Today the big holes are a little smaller than the early ones....more likely because big shallow holes are the worst choice of the choices. I think the Quickchange and the Uniflow III meter better than the early ones, but I do miss the mic. on the competition model. Simply because you could write down the settings....you can still do that on the III, kind of.....

I thought the Quickchange was interesting, because you can order extra metering inserts and set them once for your favorite loads. But RCBS moved on.

 

[irishlad]

The reality is, long ago they figured out that hole size in the cylinder made a big difference. That's why small diameter deeper holes metered small charges better than big shallow holes....so they spent a lot of time trying to supply the best mix. Their Little Dandy was made for that reason too. So all three versions...four if you count the second cylinder in the original Uniflow, were attempts to find the best average. Today the big holes are a little smaller than the early ones....more likely because big shallow holes are the worst choice of the choices. I think the Quickchange and the Uniflow III meter better than the early ones, but I do miss the mic. on the competition model. Simply because you could write down the settings....you can still do that on the III, kind of.....

I thought the Quickchange was interesting, because you can order extra metering inserts and set them once for your favorite loads. But RCBS moved on.

Love the Little Dandy for pistol loads.