MOA reticle question

Hey everyone, I kinda asked this before but there is something else that I would like to know and/or be taught.
I have a: SIH412X40FTMOA-20 (Item# 31021 on their site). Now this scope's hash marks are considered to be 2 moa spacing on 12 power. On Sightrons site they have a chart in the bottom right hand corner that makes no sense to me what so ever so if someone can explain that along with my other question (at the bottom) I would greatly appreciate it.

It's sitting on a RWS 54 Air King .22cal shooting 18gr JSB @ 748fps with a BC of .033 and the scope height is 2.25 inches.

On my android phone I have the chairgun app:

It's zero'd @ 28yds and that number is in the far zero box and in the target box is 50yd all this is plugged into chairgun.

I have a old rain spout that is 3.25" wide sitting at 50yds away

It tells me my drop is -2.39"; 19 clicks; -4.6 MOA; 1.33 Dot

Ok, here is the questions:

The 4.6 Moa, would that be 2.3 hashes on my reticle since my reticle is 2 moa per hash mark? Because at 10yds it says i'll be -.83 inch low, 7.9moa and 2.31dot. well i confirmed that by shooting at 10yds and I was -.85 or -.87 inch low and about 4 hash marks low which multiplied by 2 is 8 but very close to 7.9MOA. So can i assume that the same principle applies for the longer distance?
My whole reason behind all this is because Chairgun doesn't have a MOA reticle and I don't know how else, aside from actual range time, can I see where my shot would or should land according to Chairgun. Again I don't need reminding that I got to go out and shoot it because as I already stated, I know that. I just need answers to the questions asked. I apologize if that sounds in some way rude but I see people who post questions or they share something and then you have people who answer the questions but then they're some people who start talking about everything else but what is needed.

Also if there is anything else that I should know about a moa reticle please tell me. I do know that to range find w/a moa reticle, you can take the target's size in inches divide it by the amount of hashes it fill and multiply it by 95.5 or take target size and convert it to moa at 100yds divide it by amount of hash marks it fills and divide by 100. Thank you RSterne.