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Rangefinder is on the mark about Lee's tumble lube. Take a look at the mold's box, is there a TL (tumble lube) prefix to the part number? The OP indicated a RN and Lee's 429-240-2RN has their conventional grooves, it's the TL340-240-SWC that is a tumble lube. And, yes, some Lee molds have bigger grooves than others. I've found some of the Lee conventional bullets are happier with heated wax lubrication. I shoot Lee's 429-214-SWC and would be happier if it were grooved like their 452-200-SWC.
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