I think you may be putting the cart before the horse. If you are serious about shooting at big game past 400 yards, In my opinion, I would go out and start shopping for a good scope that you can dial with. But if you are intent on just holding with the scope that you have, you don’t even need a ballistic solver to figure out what the hold is. If you sight in any flat shooting rifle to 200 yards….your drop will be around 6-7 inches at 300 yards. At 400 yards your drop will be around 18-19 inches. Beyond 450 yards, it becomes exceedingly difficult to hold with a standard duplex reticle. Any ballistic app you can get on your phone will give you a drop table if you want to go to a BDC reticle or custom turret.
A comment about bino glass quality…The best glass in the world will be somewhat degraded because of the coatings needed for the LRF display…That and the form factor required to get all of those “gizmos” into the binos. If you look down the right tube at the objective end, you will see a slight blue tint. That is the coating for the LED display. All brands have it. I have never looked down most of those alpha binos, but I did buy a Sig Kilo 2nd gen and the glass was pretty good. I sent it back because it didn’t have some “creature features” that I wanted. I bought a pair of Revic BR10s and I tell you what, the glass is excellent for a LRF bino.