First what Single shot rifle do you want to build on? Ruger, Sharps, Rolling block, highwall?
I must tell you that your statement as quoted to below tells me that you have a lack of experience both with rifles and hunting. Let me show you.
I am not sure what I would have built for sure. I suppose something in 7mm.
What 7mm do you want. You should have some idea. There are a lot of 7mm's them out there with velocities running from anywhere from 1800 fps to almost 3100 fps. You should already have some idea what cartridge you are looking for here. What velocity and bullet weights are you looking at?
I have been more into specialty pistols than rifles so I guess I would have to think on it. I am guessing it would have about a 1" tube with a length of about 26".
Do you have any idea what a one inch barrel 26 inches long is going to weigh. IT would make a good varmint barrel weight, but not a field hunting gun that would be carried all day. Much too heavy.
I would probably have a brake of some sort glued to the end.
Why do you need a muzzle brake on a 26 inch long 1 inch diameter barrel. If you are so recoil sensitive then get a proper fitting stock. Too many people install muzzle breaks to dampen recoil that could be better controlled by proper stock design. And, I am not talking about a big hunky recoil pad. I am talking about a stock with proper pitch and length of pull. Something a custom gunsmith should do for you building a gun.
I love custom triggers in the 1 pound range.
Stick with a 3 1/2 pound trigger for a hunting gun. Leave the light triggers for the bench. In a field gun with a light trigger and an adrenalin rush you are too likely to shoot before you are ready.
Scopes that I can dial into about 24 power.
Heavy and useless in the conventional hunting field. I have a 4x12 Leupold on my 308 Norma Mag, in the 20 years I have had it, I have never used 12 X any where except on the range I have shot antelope out to just over 300 yards with this gun . Every year I threaten to take this scope off this gun and put on fixed 6X scope. This gun is so accurate, that superstition says don't mess with it.
I have some 6x -24x scopes on my Varmint rifles. I have taken prairie dogs, rock chucks and one Richardson ground squirrel over 500 yards with those guns and I didn't find use high magnifications useful. at those ranges 12 or 14 X work just fine. Finding the target and getting a solid rest is difficult at longer range with high magnifications. The only time high magnification has been useful is on the target range at 100 and 200 yards on well bagged guns. In fact on the range when I sight in is about the only time I use the high magnifications. In the field for varmints I find 6X most useful for Rimfire and small centerfire ranges out to 200 yards. My current favorite long range varmint Remington 700 .223 has a Leupold fixed 12x. Beyond 300 yard Objective focus is critical. I do shot varmints beyond 300 yards with these guns. Shots out that far are often misses. Misses of two or three inches at 400 yards on gopher is well a miss. Misses of two or three inches at 400 yards on a deer is the difference between a dead dear and gut shot deer.
I would like it to make a corpse out of a whitetail at 400 yards, an antelope at 500. Nothing fancy just just capable of knocking the lungs, liver and light out of medium size game if I do my part. Any ideas or recommendations are certainly welcome!
I find your syntax a bit juvenile and disrespectful. We are not bubba animal butchers, we are hunters and we don't need to be crude about. I can assure you those who don't want us hurting animals at all will only dwell on the crude portion of your statement and totally ignore everything else. We are hunters and we do kill animals but we don't need to be crude about it..
The others have beaten you up pretty good about shooting deer so far away. So I won't go into it much further. In 45 years of hunting I have made to many bad shots at close range to encourage anyone one to shoot long range with out extreme special skills and circumstances.
So lets bring this back bring this back on topic by helping you come up with a nice custom single shot for deer hunting.
So what single shot action do you think you would like to start with?