A 3-9 variable gives you a wide enough range for shooting at the distances that you noted ... and mucgh farther. A quality 40 mm is an excellent choice.

My experience with the Ziess Conquest line has been outstanding. I have, and have had, a lot of different makes and models of scopes over these past 50+ years. MSRP from about $35 to abut $2500. For the $$$ the Conquest is probably best buy that I have come across.

Look into a Vortex Viper. Super clear and crisp, you will not be sorry. Best warranty in the industry.

you had made mention that it will be sitting on a semi target rifle. what are your plans for this? if you want tight groups or pshoot for small targets id maybe opt for something with some power. but if you just want to ring gongs all day then a 3-9 will be just fine. personally id go for something in 4-12 or ideally 4-16 to really help make use of all the potential a 6.5 creedmore has to offer without having to much magnification for most deer hunting. if you can ever get the chance to compare a 4-16 against something even as big as 6-24 you will see there isn't much difference out to 800 yards or more if gongs (or anything else with a 10'' vital) are your planned targets.

Burris Full Field II. Good luck

update?