Well I finally bit the bullet and bought a Dillon 550B. My question is do I need to replace all my Dies with Dillon Dies? That would be quite an investment as I have a ton of Lee Dies already. I'm starting off with the 45 Colt as that's my biggest shooter. Next conversion kits will be 44 spec/44 Mag, 38/357mag. I also load 458 Socom and 480 Ruger, but I don't see that Dillon has those conversions or dies. Also, do you guys buy the expensive quick change conversions or go with the cheaper versions where you use the same powder drop? This is all very complex for a guy that has never loaded on anything other than my Lee single stage......