I have read there are differences when dealing with smokeless powder. All of this may be true but maybe someone here who knows more can tell me if firmly ramming a tight projectile over most smokeless powder charges causing the charge to be tightly packed is a good idea........
Ok in GENERAL terms- most smokeless loads will fill the case to over 50% full and some will have light compression of the powder. In the world of smokeless powder, there is a thing known as Burn Rate meaning different types/grades/brands of powder burn at different speeds. Fast stuff is usually for pistol while slow stuff is for rifles. Again, this is in general terms.
In most centerfire cartridges, in GENERAL, a less than 50% fill will result in poor accuracy for a variety of reasons.
Primers- slow powders and larger charges, in GENERAL, need a magnum primer for consistent ignition.
The margin for error, in GENERAL, in smokeless varies. This is the result of using differing charge amounts, compressed v less than 50%, shape of the cartridge (straight wall v bottle neck), weight of the bullet, type of bullet, temperature, seating depth of the bullet relative to the rifling. One common error seen by novice reloaders is to use a fast burning pistol powder in a rifle, usually with disasterous results. Another common error in loads with less than a 50% fill is a double charge, ie twice the amount of powder called for in the load data. This happens mainly in handguns, again disaster ensues.
So shooting smokeless in a muzzleloader, while it "is possible", there are far too many variables compared to straight black powder. The common misconception is that "you can't over load a muzzleloader". In GENERAL with real black powder, that's not too far from the truth as the burn rate and pressure of the holy black is pretty constant between brands. The only way to increase pressure is to switch from 2f to 3f to 4f. Yes, pressure goes up because more of the surface area of the powder is exposed as granule size falls but in nearly every case, this isn't catastrophic. That's why you can get away with being less precise about charge levels with black powder but if you want accuracy, you'll be just as precise about loading as a person using smokeless.
Two different worlds, two different sets of parameters. As once said, "stray but a little" and bad things can happen if you don't really know what you're doing.