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I have a Lyman Lubrizior (?) 4500. My bullets that I size have 2 grease grooves. Is it okay to tumble lube these rounds? Or do I need to fill just the grease grooves? 
I second that suggestion. The only thing I'll add is that adding some denatured alcohol to the Lee liquid lube causes it to deposit a thinner coat that works better in some firearms. It also speeds drying time.Try some and see how it works. Worse that can happen is you have to clean out some lead. Bullets for tumble lubing have a different configuration. Since you have the lubrisizer and are sizing them anyway why not lube them as designed?
Try some and see how it works. Worse that can happen is you have to clean out some lead. Bullets for tumble lubing have a different configuration. Since you have the lubrisizer and are sizing them anyway why not lube them as designed?