Howdy
First of all, please refrain from using the term holy black. I first saw that term on the SASS Wire years ago, and I have always thought it was silly. Black Powder is just a very old form of propellant, there is nothing holy about it.
Second, I generally shoot my Black Powder 45 Colt cartridges in cartridge revolvers. The only Cap & Ball revolvers I have with conversion cylinders are Remington 1858s with 45 Colt conversion cylinders. I generally shoot 45 Schofield ammunition in those revolvers because the grip shape of the Remington is different than the grip shape of a Colt Single Action Army or its replicas. The different shape of the grip on the Remington makes the recoil of a full house BP 45 Colt load uncomfortable.
Lastly, I am not a hunter, so I have no comment on what may or may not be acceptable ammunition for any particular animal.
OK, having said all that, I have been loading Black Powder in cartridges for about 20 years now. The cartridges I load with Black Powder are 45 Colt, 45 Schofield, 44-40, 44 Russian, and 38-40. I also load 45-70 with Black Powder for my Trapdoor Springfield and Sharps rifles.
45 Colt. I will pretty much echo what MEHavey said.
"1.
Full case (+) of Black.
2. Bullet has to have
wide grease groove
3. Bullet need to be
SOFT... pure lead isn't too soft
3. You need to use very soft
BP lube...not more modern harder lubes
Expect to have to clean the face of the cylinder every loadout."
The only thing I will disagree with is having to clean the cylinder frequently. Any revolver with a decent cylinder bushing standing proud of the cylinder face will not need the cylinder cleaned frequently if enough soft BP compatible bullet lube is used on the bullet. Since the 1860 C&B Colt has no bushing on the front of the cylinder, you may need to wipe off the front face of the cylinder more often than with a revolver that has a bushing on the front of the cylinder.
As can be seen in this photo, both the Colt 1860 Army cylinder on the left and the Remington 1858 cylinder on the right lack a bushing on the front face of the cylinder. This allows fouling expelled from the barrel/cylinder gap to be blasted directly onto the cylinder pin of the Remington or the cylinder arbor of the Colt. That is the main cause of binding when shooting Black Powder, fouling blasted onto the cylinder pin. The Colt (actually a Pietta) 1860 Army cylinder arbor has a helical groove cut along the arbor which creates clearance for fouling to accumulate. This and the slightly larger diameter of the Colt cylinder arbor makes the Colt slightly better at resisting the cylinder binding when shooting Black Powder. When I fire BP cartridges out of the Remington with its lack of a bushing and narrower pin, I truly have to wipe off the cylinder face after every cylinder full of ammo, or the cylinder will start to bind.
Left to right, these cylinders are from an Uberti Cattleman, a Ruger 'original model' Vaquero, and a 2nd Gen Colt Single Action Army. The bushing on the front face of each cylinder shields the underlying cylinder pin from fouling blasted out of the barrel/cylinder gap. With Black Powder ammunition using bullets with plenty of soft, BP compatible bullet lube, I can shoot these revolvers all day and not have to stop to wipe off the cylinders.
This is a photo of what goes into my Black Powder 45 Colt ammunition. I use standard Large Pistol primers in my Black Powder 45 Colt cartridges. The bullet is the Big Lube 250 grain PRS bullet already referred to by another poster. I have stripped the lube out of the bullet on the left to illustrate how large the lube groove is. My usual load for 45 Colt is about 33.5 grains of Schuetzen FFg. However, you need to realize that different brands of Black Powder weigh different amounts. The best advice I can give you is the correct amount of powder in any Black Powder cartridge will be compressed by 1/16" - 1/8" when the bullet is seated. 33.5 grains of Schuetzen FFg does that for me with the Big Lube PRS bullet. Slightly different grain weights of different brands of powder will do the same. The reason the 2.2CC Lee dipper is in the photo is because that dipper provides the correct volume of powder with that particular bullet in a 45 Colt case.
When using a dipper like this, pour about 1/2 pound of powder into a ceramic cup and use the dipper like an ice cream scoop. Scoop it through the powder with a consistent motion, and use a piece of card stock to scrape off the excess. Using this technique you will consistently dip the correct amount of powder for this bullet in a 45 Colt cartridge.
This photo shows a 45 Colt round on the left and a 44-40 round on the right. The Big Lube 250 grain PRS bullet is pictured with the 45 Colt round, the Big Lube Mav-Dutchman bullet is pictured with the 44-40 round. I have removed the lube from one of each bullet, demonstrating how much lube each bullet carries. This is the secret to keeping a Black Powder revolver functioning for a long time without binding, lots of soft BP compatible lube in the lube groove. The soft lube keeps the fouling soft, preventing it from binding the face of a revolver cylinder, and preventing hard fouling from building up in the bore which can destroy accuracy and is difficult to remove.
I used to cast my own bullets, but the lead content in my blood is too high now, so I buy all my Big Lube BP bullets from Whyte Leatherworks these days.
http://www.whyteleatherworks.com/BigLube.html
When I was casting my own bullets I was using SPG lube. Mark uses his own home made bullet lube which works just as well as SPG.
Any questions?