let me give you the answers to those specific questions. :-)
Using your numbers, you will have 210,000 pennies in the "copper" bucket, and 790,000 pennies in the "reject" bucket. It is NOT the "zinc" bucket. It is anything that is not the same as the 1974 copper penny you are using as your control. (By the way, I'd replace that 1974 with a 1981, as there was a little issue with quality from 1974 through 1979 on some pennies. Not many, but it is safer to use the 1981 instead of anything from the 70's. That's what I've been told anyway.)
The copper side will contain copper pennies from 1944 through 1982. It could have a few older ones in it, but not many. Of the 210,000, I'd say you would have about 3,000 wheats and the rest will be memorials.
On the reject side will be your zinc, your older wheat pennies (maybe 50 if you are lucky. And that is in a MILLION pennies through the machine), any steel war pennies, all IH pennies, any dimes that came in the rolls accidentially and some foriegn coins. Notice it is MUCH more than just "zinc". But, your older wheat pennies WILL be in THIS bucket. Hence the problem.
Some people run this batch a second time, using a zinc pennny as the control. I decided a while back that it was a waste of time and too much wear and tear on the machine to do it twice. So as I sort the pennies, I keep an eye on the reject bucket while it is working. I SEE the older pennies and foreign coins that pop out and if they are wheat or IHs I grab them while the machine is still working. That takes care of having to do the double sort. I don't care about dimes, because they are going back to the bank anyway. When the coins are done running, I then take the reject side back to the bank. I then take the copper side and sort them by hand. I do that because although the machine CAN sort the old wheats out, it will NOT sort out the 1944 - 1958 wheats from the 1959 - 1982 memorials. They have too close of a same composition. So I turn them all over, in a hurried manner, and pull the wheats out. The wheats I mark by year and put in rolls, and the memorials I put in penny boxes and store until the time comes I start selling again on ebay. Then I"ll sell off the copper again.
That is how I sort one time and get almost all the wheats and IH pennies out. I amit I might miss a few. Of the 50 "older" wheats that go tot he reject side, I bet I find 47 of them anyway. So, to go through the reject sice again on 790,000 pennies ot find maybe 3 (or even TEN!) older wheats is just not worth it. If I go through 790,000 NEW pennies, I'll get about 40 older ones (instead of 3) PLUS the 2,500 or so wheats that come from teh new batch. Make sense? YOU'll get more by going to new rolls and new coins instead of spending the time getting the few remaining ones that you might have missed. And after doing this for a while, you get pretty good at seeing the older ones as they pop out into the reject side. :-)
So to answer your question, MOST of the wheats will be on the copper side, with the 210,000 coins. Some of the wheats (the oldest and best ones) will be in the reject bucket, and hopefully you were able to keep an eye on it to sort most of them as they fell into it.
By the way, I have found that my coin hopper gets indented with a groove on the bottom of it about every 1,000,000 coins, so you have to buy a new one every 1,000,000 coins. Running 790,000 of the first 1,000,000 a second time means spending MONEY to find some coins that will give you ... about as much as it costs to keep the machine running. Just not worth it. Give me new batches, and I'll run those instead. :-) The coin feeding plate needs replaced about every 500,000 coins. And it needs cleaned often. But running an additional 790,000 coins through to get maybe 5 - 10 missed wheats doesn't make sense to "me". I'll find tons more copper, wheats AND older wheats by running a new batch of 790,000 more coins in that same timeframe.
Just keep your eyes on the reject bucket as you run it though. YOu'd hate to miss that rare IH that at times comes out on that side. :-)
That answer what you wanted?