About 1980 I bought a Shiloh Sharps 45-70. It had very shallow rifling and a very oversize throat. I friend who was a Sharps collector and cast bullet shooter told me the shallow rifling was actually used in originals for paper patched bullet. The rifle shot very poorly with grease grove bullets, and my friend suggested paper patched.
In those days there was very little info about the original Sharps loading--Elmer Keith collected Sharps and wrote about shooting pp bullets in originals, but with no details about the loading. No molds for the non-grooved bullets, except for originals if one were lucky enough to find one at a gunshow.
Ron lent me the NRA Cast Bullet Handbook (I later bought my own copy which I still have and which is not for sale). It has reprints of a number of article Col. Harrison wrote in the Rifleman in the '70's about 30 cal pp bullets and loading, assisted by our own Ed Harris. No info about 45 cal or black powder, or breech seating, which I wanted to use in the Shiloh because I wanted to use the rifle in a sheutzen match. I modified the design for the NRA 30 , cal bullet and had Hoch make a 45 mold. It cast a 385 gr bullet which just filled the throat of the Sharps. Using info from Ned Roberts book The Sheutzen Rifle I got the rifle shooting very well, and another friend used my rifle and load to win the Boyd Hilton trophy at the next Ashevillle Rifle and Pistol Club sheuitzen match.
Well, I recently bought a mod 1893 Marlin in 32-40. Very tight rifle with strong rifling which looks to be a shooter. I loaded some .323" dia cast bullets and took the rifle to the range. I also had some John Wayne commemorative Winchester rounds I've been saving for 30 years. The cast bullrts hardly kept the bullets on the target paper The jacketed bullets were no better, most of them keyholed. Slugged the barrel and found the bore dia .232" and the grove dia 330".
I read all the pp info in the archives and a good deal of material on the net. I found that there is no discussion of PP bullets in 32-40 loads at about 1300 fps. Seems everyone is interested in the 30 cal loads for a 30-06 or 308, or a 45 cal "Quigley" load. I take it that all the info on sizing, lube, etc. from the 30 cal can be used by increasing the dia proportionally, but are there any other changes anyone would suggest loading a 1300 fps cartridge shot through a less-than-perfect bore? Thanks in advance.