500 Linebaugh SubSonic ??

[Wicked]

I have some suppressed .50 caliber questions and found out about this forum from some members who also belong to silencertalk.com. I am Wicked over there as well. I've been cruising around here for a few days and have picked up a good bit of info that I had questions about. Still, some things are unanswered, so I'll ask.

Background info: I live in Ohio and deer hunt with a 15" Encore pistol in 500 S&W Magnum. Unfortunately, there's no rifles for deer hunting here and no hunting at all with suppressors. I build my own Form 1 suppressors even though I can't hunt with them. Anyhow, I got to thinking about how much I like the 500 Smith and what would be the next logical steps in bigger & better? Even if I didn't use it for hunting here. Answer - .510" diameter, 750gr Hornady A-Max bullets. Here are my proposed requirements for the use of this bullet.

1.) Velocity - exclusively subsonic for use with suppressor
2.) Platform - bolt action rifle. Encore might do.
3.) Effective range - 100 to 300yds
4.) Use - range toy on steel mostly, options to hunt with it very distant 2nd.
5.) Price tag - $1000 not to include optics/mounts/dies/ect.

Here are some of the potential cartridge options I've researched :
50-70 Govt. - Rimmed, Encore only. Too much case?
50 Alaskan - Rimmed, Encore only. Too much case?
500 Linebaugh - Rimmed, Encore only. Case capacity about right.
.510/.458 SOCOM - AR platform
500 Whisper & clones - AR platform, brass is expensive
500 S&W & 50 AE - Wrong bore diameter

What others am I missing? I don't think most of these will work well in a bolt gun because of the case rim. Thought about a Siamese Mauser but the mag well is too short. What if I made it a single shot bolt? Any good options with WSM or other fat cases? Would a Magnum length action be required? I'd prefer not to have full custom chamber/die reamers made if possible.

The best/easiest/cheapest option I see at this point is to long chamber an Encore barrel in 500 Linebaugh. Thing is, I've been able to find NOTHING online about anyone doing this. Can't seem to find the reamers either. There must be a reason/s I've missed. Has something like this already been done? Pros/Cons? Any help, advice or your thoughts would be appreciated.

Pete