Just reamer work, that's all.
I do not know the strength of the Pedersoli reciever, but I do know about the C. Sharps Arms and Shiloh Sharps rifles.
A word on reciever strength, as there is a lot of myth of not shooting smokeless powder and whatnot.
The Shiloh reciever is investment cast just like a Ruger No. 1. The C. Sharps 1874 reciever is machined out of a block or plate of stock, and their 1875 reciever is cast for them by, you guessed it, Ruger.
Both of these companies are located in Big Timber Montana, and I have lived there for 5 years, so it gave me an opportunity to buy the rifles and talk one on one with the owners.
Both C. Sharps and Shiloh assured me that their rifles were in the pressure/strength territory of the Ruger No. 1. They are made of modern steels and have been tested to be safe for smokeless loads. The makers advocate black powder for best performance though. It is a tradition.
Now some might say that the big cased were designed for black powder and that smokeless is not the way to go.
Well think of this. Take a 458 lott case and you pretty much have a dead ringer for the 45-110. What will the 458 lott do? Yep. the 45-110 , or the old 450 Nitro will push the big bullets out with wallop.
I like black powder shooting, but I also know the that my personal Sharps rifles can push out big bullets faster than a 458 winchester if needed. Heck, my 75 sharps is nothing more than a No 1 Ruger with a hammer.