RE: Muzzleloader shooting techniques ?
I shoot my MLs the same way I shoot my smokeless rifles.
Recoil Before or After - Not sure but would say after the bullet leaves the muzzle.
Lead Sled - That's a personal preference. There should be no reason why you couldn't.
I'm not an expert in BP vs Smokeless but this may be due to the burning rate of the BP (and substitutes). Smokeless powder (Nitro) does not require oxygen to burn and pressures peak rapidly. This quick increase in pressure results in a sharper 'punch' rather than the 'shove' you get with BP.
I do know that if you shoot a 450 gr bullet using 100 gr of BP from a rifle with a steel buttplate while wearing a Tshirt - it has a tendancy to get your attention.
Other than that the only difference I see in shooting a ML from a smokeless cartirdge is the time it takes to see if you hit your target waiting for the smoke to clear.