Since it’s .17 HMR, I figure you want to shoot 0-200 yards however you have a 455 and can easily swap to .22 LR and start playing the CRPS/ORPS game.
Key consideration in my opinion:
Must have an adjustable parallax.
Adjustable zoom in the 4-16 or 6-24
Reticle with windage and elevation mark
First focal plane so you can measure at any zoom setting
MIL or MOA…Up to you
Options to consider ( not in any order)
VORTEX. diamondback tactical 4-16 or 6-24 (I have two of these and I wish they had a zero stop)
Athlon Argos BTR 6-24 (has zero stop)
Arken SH4 gen 2 4-16 or 6-24 (34 mm tube so rings are different), has zero stop
New line called Scorpion has the TARGET MASTER WILDCAT FFP 6-24X50 which also has zero stop and illumination.
Below $300 you will only get a duplex scope with fixed parallax.
Save some $$ go get an entry level scope for precision shooting. Look at equipment exchange, I lucked out a while back and got a bushnell rimfire 3-9 scope with exposed turret, adjustable parallax that now sits on my back up 455.
Wait for the Cabela's Covenant 6-24 FFP to go on sale for $250, usually happens every 3-4 months.
I shot one if my ORPS rig for months and was happy with it.
I'd recommend getting one with an adjustable objective (AO) for parallax correction.
I find it makes a big difference when shooting targets because the fixed ones are set to either 50m (for rimfire scopes) or 100m. At other distances, the crosshairs will move (relative to the target) based on how you're looking through it.
I didn't know anything about this when I bought my first scope and wish I had.
Yes this is important. So many guys just think of parallax as a focus setting and often times best parallax is not in clear focus.
If you shoot in any kind of long range like bench rest or F Class, you can see who the real shooters are when they set up... Their heads and nodding and bobbing like a pitcher negotiating with the catcher in a baseball game as they confirm parallax. The guys that simply set it based on focus are never the top guys.
Wait for the Cabela's Covenant 6-24 FFP to go on sale for $250, usually happens every 3-4 months.
I shot one if my ORPS rig for months and was happy with it.