Does the RCBS unit have a built in cover?? If you cover the Dillon separator it will help a LOT to keep it from flying all over the place. I'de go with whichever one handles the most cases and is the widest as that will help to prevent spillage when you pour everything into it. I have the large Dillon separator and it is nice.....as long as you spin slowly to prevent flinging the media everywhere, or spin to your hearts content with a box covering it.
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