I use the Vomz 1.2-6x scope, it's become my all-around favourite scope, actually.
It started with my accurizing/bush deer SKS project. As a rule, you're not shooting anything past 200 yards with x39 (yes, I know, it can be pushed further - but practically, I'm not even going to shoot a deer past 150 yards with x39). Zero it at 100 yards, and with height over bore, you end up within a couple inches on elevation from 0-200yards. After 200 yards, x39 REALLY starts to drop, which is why I don't bother much past that.
It worked out really well. Good reliable setup for bush deer. I leave it dialed all the way down to 1.2x for "walking around" which gives a very generous eye relief, and a very clear point of aim if a deer pops out of its day bed within 50 yards (see pic below, that's basically what happened here) and I need to get a shot off fairly quick. But if I spot something a bit further on down a cut-line, and I know I have a moment to aim, I can dial it up to 6 for good shot placement at distance.
That optic has ridden on that gun for, oh, 4 years now... See no need to change it. It works. It's held up. Does what it needs to do. Simple cross-hair for aiming.
In fact, I liked it so much, got the same scope for my 3-Gun AR. Again, leave it dialed down for snap shooting the close in targets, dial it up for shot placement when the evil @#$%@# who design our 3 gun courses make us try and hit stuff at 100-200 yards after running around and getting winded. The pic below is from when I first set it up a few years ago (3 years ago?). I kinda don't like AR's, but I enjoy 3-gun (which almost necessitates an AR), so I don't treat the gun kindly. Had this rig out to Hungry's CQB clinic a few weeks ago, and looking over the gun, it occurred to me just how banked up it's become. But the glass still works.
Again, I'm thinking of these guns in terms of "200 yard shooters" - if I'm going to be shooting much past that, I have full powered rifles that are just orders of magnitude better at the job. Out to 200 yards, with either 5.56 or x39, bullet drop isn't much of an issue. POA and POI are going to be within a few inches on elevation if you zero at 100.
My 858 I've set up different. On it I'm using a forward mounted Red Dot, a Sig Sauer Romeo 5 mounted right at the front of a handguard rail. I never really fell in love with Red Dots, but when I set this up I realized it was because I'd been "doing it wrong" before. I'd been mounting the Red Dot over the receiver, and close to the ye, like a normal scope. When I set this up, I decided to try something different, because the handguard rail necessitated a forward mount anyway. So I mounted it as far forward as I could.
And now I love Red Dots.
With the optic mounted this far forward, it occupies far less of your field of view, while still providing a very clear aim point. The "dot" also becomes smaller, which allows for more precise shooting that is possible with the giant glowing red blob right in front of your face. It makes it easier/quicker to acquire. Just all around a better way to mount an RDS. In this case I have it zeroed at 50 yards, and it works great out to about 150 yards, and passably well at 200.
Anyway, just some food for thought to give you something to think about. Any way you look at it, I wouldn't worry about BDC reticles for this calibre. Zero at 50 or 100, and forget about it. You'll shoot well out to 200 yards, passably at 300 yards, beyond that, you're stretching past the effectiveness of the cartridge anyway.