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Some thoughts:
Make sure that whatever caliber you choose that the chamber is cut for the longer, low drag bullets you are wanting with a fast enough twist rate.
Even with a brake, the 50 AK kicks like a mule in an encore setup. I shoot big bores all the time for long range, but a 750 AMax in a 6lb gun will bruise your shoulder after a few rounds. Add a can and it will take it to 12 ga 3 1/2" recoil levels.
The 50 AK brass is much cheaper than the 510 whisper, and available from starline. I suggest comparing the costs of the other calibers you mentioned.
The 50 AK brass lasts a long time. I think I'm on my 9th or 10th reload of the first 20 cases from the 100 I bought from midway.
Use heavy enough threads for the can.
Take a look at some of the commercial offerings. I had Elite Iron build both my barrel and can, roughly 700 each if I remember correctly.
In the encore frame with a can on, the rifle is very front heavy. If I had the tools to do the work, I'd select a bolt action frame with a heavy fill McM stock. Then install a mercury recoil reducer in the butt, overlaid with a good recoil pad. I like the limbsaver pads on my duck guns, and they would probably work well here too. The barrel channel can be milled/sanded to desired free-float fit. I'm not sure if there is a mag system that will handle the 50 AK with 600+gr BMG pills, but that would be quite awesome if you could find one and modify it.
If you want to keep cost down, go with the encore set up. If you want comfort with a little more weight, go bolt action.
On bullets:
While I took the rifle out a few times to the farm, I never got the opportunity to drop anything with it. So out of curiosity on what a 750 AMAX at 1050 fps would do, I built some thick clay mud boxes with a target in the front so I could both compare groups and penetration (at $4 per shot, look for any efficiencies you can). At 100, I was getting 1 1/2" groups with the encore. Considering a 1/2" pill that kicked like a mule, I was most satisfied. For penetration, it was easily going through the 30" of thick, wet, compacted clay with only a little deformation at the tip. I pulled 4 out of the backstop and they all looked similar. I couldn't tell if they had tumbled like the 30 cal SMK's do, but if they did it would be a huge exit wound.
I'd recommend also trying some pulled 690gr mil fodder since you can get them much cheaper.
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