Fly rod actions effect on roll casting

Anyone have any input on how a fly rods action affects/effects roll casting. I currently have a moderate action Okuma SLV that I like but I am wondering if a faster tip may help get the line out easier. I test drove a Reddington with a fast action the other day (just handling it in the store no reel or line) and it seemed to have a bit more snap. However, it could just be that I would like a shiny new rod and thought it felt that way. I am practicing in the yard and on the water, to try to get the technique down and just have it look and feel natural but have not gotten there yet.

Thanks,

Jacob

i found my med/fast and fast action rods roll cast way better than my medium action and with less effort and arm movement.
a faster action should roll cast a lot easier, with weight forward line, than a softer action. also a longer rod roll casts better.
in short distance i find a DT line is much more effective.
this is my own experience.
 
like RIZ says, water surface tension makes for better practice when roll casting.

Thanks gents! Thats what I figured,it would take more to load the med action with less energy released..... well, looks like I need to buy a new rod........ well, not need but want.

Thanks again!

Jacob