I have both the RCBS mag and the Lee 4-20 Pro like them both equaly. For the $$ go for the 4-20. The 10# is to small, at least for me. most of my casting is 58 and 69 ca. had a 10# pot it was Just ok for 44 cal 2 cav. mold but runs out to fast on others. Just as you get going its time to refill it.