Rifling is a bit fast for RB - well, way too fast. As you probably know, I prefer round balls - if possible, but the twists are not slow enough. Squib loads might shoot for plinking or for grouse, but that's about it.

The Kodiak has tight bores for sure, with deep rifling. This means to me that the bullets will need to be seated very deeply in the case.

You'll want to use a drop tube to get the powder compacting in the case well for proper burning, then - about 1/8" max compression - THEN seat the bullet onto to powder.

No wad with a HB - the wad will be driven/pushed up into the hollow by the pressure and throw fliers. It will also prevent proper obturation of the bullet skirt - perhaps prevent is not the proper term to use here - rather, a wad 'might' prevent 'even' obturation of the skirt, thus destroying accuracy.

If the bullet fits the grooves and a HB will before it even moves (if softer than WW), then there is no requirement for a wad. Of course, this means a full charge, of course. You will get melting of the base when the powder gases can rush past the bullet up the bore - ie: gas cutting.

Just for fun, I'd try some 405gr. RP's or WW jacketed bullets with black powder. My brother's Sharps, shot them splendidly - no wiping - 3 300's or 500's would make one hole groups (sub 1") at 100 yards off bags, with either the 2 1/2X scope, or his tang and post. Wish we could see that well today.