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Old December 8, 2012, 01:58 PM   #1
rebs
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RCBS small powder drum ?

For reloading small rifle and pistol, does the rcbs small powder drum work well and is it more accurate than the large drum ?
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Old December 8, 2012, 06:25 PM   #2
Unclenick
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It is generally easier to use the small chamber accurately for light loads because it gives you finer adjustment of the charge volume. This is not just a matter of the graduations, but also because an adjustment that is only a couple turns from bottoming out changes the total volume 50% when you turn it in one turn, while one that is five turns from the bottom changes the volume only 20% when you run it in one turn. The adjustment is finer and easier to control in both senses.

In addition, a nearly bottomed out adjustment also has a higher percentage of the volume that is bottom corner and top scrape-off surface. Those are both places vulnerable to variances in powder bulk density due to how grains stack or lean and how scraping disturbs them.
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