"Cheap" or "Inexpensive" there is a difference.
I have lots of fun with a Remington varmint wearing an inexpensive 3-9X Leupold with capped turrets.
With torso sized targets and holding mil dots I don't worry about the internals not returning to zero because I don't move anything.....just hold.
This is my strategy, too; to eliminate changing knob settings.
I have 8 of the Bushnell AR Drop Zone BDC scopes, several with the 223 designation, several with the 308 designation, and one with the 6.5CM designation. They are mounted on my serious AR's and Bolt Rifles.
They all share a common methodology. They are all zeroed at 100yd and the elevation and windage knobs are left there. The reticle has additional distance tik marks serving as predesignated aiming points, formulated to correspond to regular 100yd intervals going outward. They are on at 100, then have ticks for additional hundreds of yards going on out to 600yd. One exception; the 6.5CM reticle has marks for out to 850yd. Aiming is done at maximum magnification, to sync the reticles with the actual distances.
They work, and nicely too. With the 223 and 308 bolt guns, shots have been tested on steel at 100, 200, and 300yd, hitting all three targets within a total of 30 seconds on a KD range. My available KD range is limited to 300yd. Faster is possible, but I hate to rush my shots. No knobs get touched in the process, the reticle handles all the range issues. It helps greatly to partner the scope with a laser range finder, and a range card can also be helpful. For the AR's, the process can be faster.
Now comes the interesting part. The 223's are on my 223's. The 308's are on my 308s and my 6.5 Grendels (the trajectories are so close that they are within 5" at 500yd). The 6.5CM scope is on my 260, which tends to shoot in direct parallel with the 6.5CM. There's another factor with
all BDC scopes, they do not factor in the effects of altitude. In essence; they're all off to some varying degree.
It is perfect? Nope; it limits the max range to the highest distance with an aiming point, typically 600yd, and in the one case, 850yd. It's not super precise, but I'm not looking for perfection, just enough precision to put fire into, or close to, the target. But in many cases, mine included, it imposes a KYL (Know Your Limits) restriction that probably increases hit probability. At these distances, the rounds are all well into the supersonic regime. For many of us, that's a plus. Another plus; it's not Chinese made, it comes out of So. Korea. The optics could be better, but for what it costs, they're quite good enough for me.
There's a bit more but it's rapidly becoming academic. You see, Bushnell has discontinued many of the line of scopes, including the ones I use. Some remain in retailer inventory; but they are few, and going fast.
I noted about a year ago that they were not so much available, and I contacted the firm. I got back a boilerplate line about how they were no longer selling. I immediately and repeatedly warned shooters on this site that these scopes were being eliminated. I also saw to it that my own needs were met.
Maybe the explanation holds water, but the only remaining BDC solution I can find that they will be carrying requires changing elevation knobs for different chamberings, and also involves knob manipulation to marked distances when changing distances. Oh, and it costs between 3 and 4 times as much.
I've done what I can to warn this site about this unique and affordable product's demise, and the situation simply doesn't pass my personal sniff test. I'd rather not say more on the matter.
Do as you see fit.
Greg