TO FILL OR NOT TO FILL?
-- I shoot with a good friend who has been shooting 40 grains of 3f in a very stout New Army .44. He has the original cylinder plus 3 extras. He loads his cylinders with a doo-dad that presses all 6 balls at the same time. The cylinders on his gun are part of a quick-change system, with a 'trick' cylinder pin that has a stop in it, to keep it from coming all the way out of the hole when you pull it to release the cylinder.
I have fired this gun, and it is fantastic for slow-medium action steel plates, etc., although it roars qite a bit more than I am accustomed to. On the other hand, fast-action shooting may be a challenge with all that smoke and the extra kick of a powder charge that equals my Hawken's target load!
My friend is an excellent shooter, and at age 70+, he has a lot of good advice to offer. (I'm 57.) Still, he was impressed with my 1851 Confederate Navy Pietta's groups on paper targets. Realizing I use extremely light loads, my friend decided to cut his load down, landing on 33 grains of 3f Goex topped off with cream of wheat and a home-cast .457 99% lead ball and Bore Butter. I didn't think he really needed any filler, but he insisted. This lighter load still would have barely been counter-sunk into the chambers. So, why use filler? In his case, he explained, he needed the balls to be compressed to a certain pressure point. To achieve this compression, his load height needs to match his loading arm's capability. That's because his loading gizmo has a stop in it, so he needs a very full cylinder in order to get good compression at the point where the arm stops pressing the balls down.
By the way, his groups closed up a bit with his first cylinder-full with the reduced load. He said he might experiment further with a little less powder and a little more filler. We shall see.
I do believe I found out at least two things about using filler to bring the ball closer to the forcing cone of the barrel. In my case I lost a bit of velocity, but I believe I gained more in accuracy than I lost in velocity. These findings may not be totally reliable, as I have only fired a few cylinders with my current load of 17 grains 3f under 17 grains (by volume) of cream of wheat.
Still, before I ever used fillers, I was satisfied with the performance of my revolver, in general. I do think my extremely mild load is best served by using a filler. Biggerloads of powder that nearly fill the chamber without filler may or may not be well served by using fillers. I would think it probably depends on the particular gun and the kind of shooting it does.
I wonder how full the chamber needs to be to avoid using fillers? Any ideas?