Proud owner of an original 1859 sharps rifle . I am firing it using American Pioneer powder because of the difficulty of obtaining black powder.I am using 50 grains of powder to fire it, seem to work pretty good. 2 question am I hurting it by not using black powder ? Sharps has what is called an adjustable bouching,is this the same as a moveable sleeve which is found in most reproduction sharps and can it be clean the same way?