i had a scout rifle ,pretty to look at but the nipple/breechplug setup
not the best.if i remember right the flame from the cap has to make a
jump to the powder and this makes your powder prone to to misfires
do the ease moisture can seep into the powder.
the other item is easily remedied , the bottom of the barrel is shaped
so that your brush will not actually clean the same actually leaving a buildup
to block part of the flash from your cap. the remedy is to take a hanger wire flatten out the end and use it to clean out the area a normal brush cannot reach.
lastly , use blackpowder for surer ignition. dan