This has a capped windage and exposed elevation turret. The Leupold rifleman 3-9×40 has capped turrets and isn't specifically for 450 Bush but is a great scope. Either way it's a Leupold and most likely a great scope. Hope this helps.

Trevor actually took time to properly research your question and give you an educated source answer unlike James' answer where he did a quick Google search and linked to a video of a similar model scope

I would disagree, according to Leupold this model has an exposed elevation turret but capped windage turret. leupold.com/vx-freedom-3-9x40-450-bushmaster-duplex-riflescope

Will, no as configured Sir. You can order a Custom Dial System Turrets (as shown starting at 1:10) here : youtube.com/watch?v=ZSo43lcWHNQ