[Gatofeo]

The Remington has a fairly short rammer that won't firmly seat the ball on lighter charges of powder. It will leave a gap between the ball and powder -- a dangerous condition.
With lighter charges of powder, it is common practice to use a little corn meal as a space filler. Add enough to the top of the powder so that the corn meal is about 1/4 inch below the mouth of the chamber. Then, you ram the ball down firmly.
The firmly seated ball will keep the corn meal and powder from mixing, by tension on both.
Corn meal is preferred over Cream of Wheat because corn meal will compress slightly. Cream of Wheat doesn't compress. Thus, corn meal is a little more forgiving if you add a trifle too much.
You may also use felt wads designed for cap and ball revolvers. These are preferred as they add some lubricant as well. I'm not a fan of the dry lubricant used in Wonder Wads, as it doesn't keep the fouling soft.
Instead, soak the wads in lard, crisco, bacon grease, olive oil or some other natural grease. The best lubricant I've found is one named after me: Gatofeo No. 1 Bullet Lubricant.
No one makes it commercially, you'll have to make it yourself.
The recipe is 1 part canning paraffin (as used to seal jars of preserves), 1 part mutton tallow (sold by Dixie Gun Works) and 1/2 part beeswax (the real deal, not the synthetic stuff sold today for toilet seals).
All measurements are by weight, not volume.

Dixie Gun Works also sells Ol' Zip Patch Grease, which is a mix of mutton tallow and beeswax. This works very well for soaking wads.

With light loads, seat two wads over the powder. Then, seat the ball.
I much prefer balls of .454 or 457 inch over the recommended .451 inch balls. The larger balls seal the chamber better, and create a wider bearing band for the rifling to grip. This, I believe, aids accuracy.

Keep in mind that Hodgdon 777 is NOT a direct substitute for black powder. It should not be used volume-for-volume with black powder.
Visit the Hodgdon website to learn how much 777 is appropriate for your Remington. If you use 777, it should be FFFG (triple F) grade and not FFG (double F) for best results.

Is your Remington brass-framed? If so, I believe that Hodgdon does not recommend the use of 777 in brass-framed revolvers. Brass-framed revolvers cannot take the forces of the cylinder slamming back under recoil, or the forces exerted upon the frame as a whole. Powerful loads with black powder, Pyrodex or 777 will wear and damage brass-framed guns.
For brass-framed Remington designs, use no more than 30 grains (some believe that 25 is the limit) of Pyrodex or FFFG black powder.

I urge the use of felt wads in your loads, as it will keep the bore cleaner and prolong the firing of the revolver, before it stiffens from fouling in the action.

Search the internet for my post, "So You Want a Cap and Ball Revolver?" or "How To Properly Use a Cap and Ball Revolver."
Search these titles and my name, Gatofeo.
These posts in other boards will give you much information.