The "snail breech" style Hawkin replica made by T/C and Lyman/Investarms has a higher success rate for reliable ignition than the Hawkin replicas made by Traditions or CVA or any of the others using a side " nipple/powder drum" style. And only if the shooter keeps the fire channel very clean and very dry.
The pellet needs the ignition source directly too the back of the pellet where the small darker true BP is added to the pellet to assist ignition. (that's why they tell ya theres a front and a back too them pellets) If the fire is coming from the side, well, most tymes it don't work so good.
Loose powder is the way to go,,with a little "knock" of your palm to be sure the "main" charge is in the fire channel.
Hope that helps,,luck too ya