Aaron
posted this
21 September 2024
Had an interesting development with Multi-Purpose Black from Shooters World. I was loading this into the 44-40 cartridges to prevent cylinder binding on the Schofield revolver. The experiment failed and I also got some interesting things to tell you.
1. The cylinder binding still occurred after 6 rounds but it may not be the crud building up. The hammer would cock, the cylinder would slightly index, and the hand would ride over the spur if not assisted by hand. I think the issue is the raised metal on the recoil shield like almost all of the Uberti revolvers have. When the next inline chamber is indexing, the case rim binds up on that high spot. I have had to remove that from almost all of the Uberti revolvers to allow smooth indexing. That being said, it is worrisome that the hand is riding up over the star spur. That will take some analysis.
2. I had mentioned previously that there is residue remaining in the cases after firing. It resembles the residue remaining in a C&B revolver shooting paper cartridges. There is an image above of that residue. It's not a powder, it's 3-dimensional and fluffy. Today after firing 18 cartridges in the Schofield, I placed the cases into a tumbler with corncob media. I did not add any polishing goop to the media so it was rather dry. When I removed the cases, they were FULL of media which had to be knocked out of the cases. Note that the 44 Mag cases in there as well did not retain any media. The media that remained in the 44-40 cases had to be scraped out with a screwdriver. The media in the cases was moist as well. How and where it got enough moisture to clump together is unknown. I ended up having to wash the cases as if I had used BP to make the cartridges.

3. Although each cartridge was filled with MP Black by hand, and each charge was individually weighed, recoil and report varied among the 18 cartridges by as much as 50%. Again like Pyrodex, the loading instructions are contradictory. Shooters World lists a "Never Exceed" charge for the 44-40 of 21 grains. They also state the charge, like Black Powder, must be to the base of the bullet. Filling the cases to the base of the bullet whereby the bullet "kissed" the charge needed 24.4 grains. It was evident the velocity was all over the place and the string variation was excessive. I was NOT impressed with that live firing and questionable consistency.
To say I am underwhelmed with the variable performance and the odd residue, the adhering and grossly hygroscopic nature of the residue, at the exceptionally high price of the product, is an understatement. I really wish Shooters World and Hodgdon would make up their minds about cartridge load data for Pyrodex and Multi-Purpose Black, but I doubt they will. If there ever was an argument to use plain old Black Powder, this is it. There was NO improvement with the use of this product and in fact, it took more steps to clean the cases.
So.....Heads Up if you are pondering the use of this product in your cartridge cases. Perhaps you will have a more favorable experience than I did.
With rifle in hand, I confidently go forth into the darkness.