BlackpowderBill,welcome to the club. I too have been drooling over these rifles. From the pics at simpsons I'm guessing that they are indeed bolt action single shots. And obviously in our favorite caliber 30-30. Since they have excellent bores they should make great lead shooters. The only problems that I see is that scopes or receiver sights cannot be mounted in the conventional way. This would be due to the bolt handle going through the rear receiver ring. here's a couple solutions running through my not so fertile brain.
1. mount a long extended target scope on the receiver ring and barrel much like these were mounted years ago. Then adjust (hopefully) the thing so that one can see through it, without having to crawl over the stock. I'm thinking of something like a lyman junior target spot scope. I have one thats been sitting in my safe way too long. its unclear as to how the case is ejected. Either straight up or to the side.
2. iron sights that would be better than the illustrated winchester, marlin barrel type. Maybe using a williams ramp rear sight adjustable for both windage or elevation could be used. Thats about the only solution that I see so far. With that 25.5" bbl length you would definitely get more velocity with that bbl than lets say a 20 1894 carbine length bbl. And hopefully better accuracy. And the bolt action is a plus because the ctg feeds from what appears to be a recess machined in the floor of the action. Ctgs could be made to fit the lands without having to worry about feeding through a magazine. But that bolt handle has to go. Should be easy for a good gunsmith to convert to a mannlicher schoenaur type bolt handle and brownell's sells the handles. Should be able to use bullet weights in cast bullets from 170grs on up to 200grs in a rifle like that. What say you. Regards, Frank