First off I load .454 balls in my 44's. My paper cartridges are made with zig zag cig papers. After I roll em, I dip the ball and about 1/8th inch of the paper in my bp lube. This is enough lube to keep them running.
My experience with conicals is mirrored with the round balls, however, I get nowhere near the accuracy from them. They load nearly as easy as the ball cartridges.
All in all however, my shooting has me convinced, and every experiment has confirmed, that the MOST accurate in EVERY c&b revolver has been , with NO exception, loading lose powder, ball, and a good stiffer lube OVER the ball.
This will meet with naysayers I am sure, however if top notch accuracy is desired above everything, then load lose powder, ball and OVER ball lube. As messy as it is ... even plain ol Crisco will suffice for over ball lube.
I have attempted the grease soaked felt wads and this by far the least successful way I have loaded any of my revolvers. NEVER have had luck with the wad thinking compared to the lose powder and lube over the ball.
As an experiment I have shot lose powder n ball with no lube whatsoever with good success if only a cylinder or two is what is desired. Accuracy goes south very soon shooting with no lube at all, but it works ... especially for a single cylinder full.
Back to the question tho ... full .454 pure soft lead balls is my choice in the Armys.
The very best accuracy load has always been ... either in paper carts or lose components ... has been 20 to 23 grains ol E 3Fg powder followed by enough cornmeal to put the final loaded ball rite at the mouth of the cylinder as close as possible to the barrel forcing cone as can be and still turn the cylinder. Not the most power mind you ... but in Colt Armys and Rem new model Armys ... this has been a consistant performer for me.