I have been running a Vortex Razor HD 5-20X EBR-2B reticle scope with 10 mil per turn turret in a Spuhr 20 MOA mount with level on my DTA SRS A1 with 260, 308 & 338 LM barrel conversions and find it to be great! As mentioned above, you're talking FFP vs. SFP, which makes a difference in being able to range objects at unknown distances. The glass is as good as on my 2 March scopes 3-24 & 5-40X with FML-1 mil/mil reticles. So far the Vortex has not disappointed-rugged on 338 with bright clear glass with good tracking. The only issue I've had is the illumination only works very intermittently, but I really never use it as I do not hunt. All my scopes are mil/mil with 0.1 mil adjustments and FFP, except the March 5-40 which has 0.05 mil clicks, which can be confusing at times. I have been shooting LR for about 1.5 years and have not yet shot more than 1000 yards.
I have a Nightforce BEAST on order for my MRAD 338 LM, which will also have 0.1 mil clicks. You really need to decide how you will be shooting-known or unknown distances as well as minimum and maximum ranges. Read and reread the Optics Selection Sticky here several times and then read all the reviews you can find on your final scope selections. Many new options available since that Optics Selection Sticky was started! No one scope will work in every situation perfectly, but buying a quality scope will give you much more flexibility in your shooting. Optics are all very subjective depending on your age and vision. I'm 65 and need all the help I can get at long distances (magnification and TargetCam). Don't need to buy a spotting scope. Also hard in most places to find places to shoot >500 yards with regularity. Yesterday I and 2 friends were hitting 12" steel diamond easily at 550 yards with the DTA 30 and Vortex. Only 1.8 mil elevation with scope on 10.5X at 4 degree incline and 90 degree temp. Mirage was moderate at 20X, which is one problem with high magnification scopes, but just dial magnification down and with FFP you can still range any target at any magnification. One of my friends had never fired a rifle before, but was dead on at 550 yards, which is slightly greater than 2 MOA and pretty easy when shooting a 1/2 MOA bolt rifle.
My son and I have a 500 yard 60 round Prone Match tomorrow and will been using that same DTA 308 conversion and expect to do pretty well, if wind cooperates. I you have a good rifle, you can do well and have lots of fun will almost any scope after lots of practice! Practice and consistency is really your friend in this sport. Just don't be changing things like ammo, altitude or large temperature/ humidity factors. Put together a package which will best suit your needs and get out and shoot as much as you can. It's a steep learning curve, but very gratifying in the end.
My DTA SRS A1 was over a $12,000 package, but perfect for me and my son. I have a second on order. That being said, you can accomplish the same results with a $3000-4000 set up, if you choose wisely. Good luck with whatever you decide!