Wow
...This is reading like an advanced science class now
.. Too much choice... too many decisions. It seems that, within reason at least, regardless of the chamber, transition and lead one has in their rifle...if they load to those parameters, the chances are one will have a respectable result. I've had a 45/110 Shiloh with their standard chamber...which is typically nice and tight anyway ..and shot bore diameter paper patch bullets without issue. Initially I had a few paper rings but once I had longer brass and had done a little more homework those went away and yes, accuracy was fine. When I ordered my 44 x 2 1/4" I was seriously considering opting for the traditional paper patch only chamber but I just couldnt make myself commit to it. Around that time I believe, Shiloh had ordered a tight spec reamer with the 7 degree transition and after some discussion.. decided to go with that option. As previously stated, it has performed flawlessly with both paper patch and grease groove and as a result is my 'go to' rifle. This was all before I started with the dual diameter paper patch route which I'm trying now. This has the added benefit of not needing to overwork the brass to get
a snug slip fit. I had been running dual diameter grease groove beforehand ..also with good results. While I acknowledge Jims reference to the taper coming from the outside of the case possibly being an issue, I've not seen it manifest itself as a problem in either of the two rifles I have so chambered. I'm also quite sure if I went with the standard Shiloh chamber with the more abrupt chamber end/ transition, when loaded to suit, I'd have no problems either. So you have the original spec Sharps chamber for pp only, the 7 degree transition ..still in a tight chamber and the 'standard' possibly 45 degree chamber stop...to a 2-3 degree leade. Seems like a win, win or win scenario. They all work...its just that one of the three means bore diameter pp only.
rgds
J.B.