Here's whut I dun. I took the fine LEE conical design for the Ruger Old Army and made it into a true Big Lube(tm) bullet. The LEE design was a good one, but the two skimpy lube groves just didn't do the job. I know, I've had one since back in the early 70s. When the pards like PRS, Mav and Snakebite showed the way to design Big Lube(tm) bullets they really opened a door wide. Now there are ten successful Big Lube(tm) designs and the DD/ROA is one of 'em.
I've found that in my ROA that bullet does something nothing else can. It has that neat .452 rebated base that starts straight into the chamber and the lube retainer ring that makes it stay absolutely square under the rammer. Then, when the lube/sized .454 bullet is rammed home on top the powder it gives a nice snug interference fit without shearing any metal. I've found that since this the case, I can shoot harder bullets and now I cast my DD/ROA bullets from straight WW metal.
Yes, they are accurate, and so was the original LEE conical. But, they don't foul out where the LEE did promptly after one or two cylinders full. The true hallmark of the Big Lube(tm) bullets with Holy Black is that they do not foul out and accuracy and function remain optimum. I'm happy to say that the DD/ROA brings the benefits we have been enjoying in BP cartridge guns to BP front stuffers.
One more thing. I've found some 13mm vials that nicely hold five lube/sized DD/ROA bullets each. A shot shell box full of these will see you thru a main match with some left over. When a pard using these goes to the loading table, he merely dumps in powder and seats a pre-lube/sized bullet near quick as loading a cartridge revolver. Then, he has only to cap and he's good to go. No need for cookies, grease over top, cylinder base pin lube, felt wads or any of the stuff that slows down the action.
I'm havin' a ball with this bullet, plus, I don't have reload any ammo when I'm done. . .
DD-DLoS