Zephyr heads

[Longspur77]

Want to shoot screw in head and trying to see some input on Zephyr heads. Are the vented ones noticebly louder than non vented. Shooting elk and deer with these and wanted big cut thinking about the Sasquatch or Scirroco. Any opinions would be appreciated.

[Over&Under]

I have shot the vented Scirroco's and did not notice any noise to speak of in flight.  They did however fly very well and only had the chance to shoot a turkey with one, but it performed very well.

[Terry Green]

I haven't found that they are louder if vented.....however...if you buy the 4 blade and don't use the bleeder....they will whistle over the vacant slot.