Good Afternoon. Been shooting a Mark I/II for 4 years and just use 80gr FF with carded wool to fill the airspace. The smell is interesting and I do get a slight snowstorm but no other issues. In fact, this beater of a rifle hits the black at 100 yards with me shooting off the table, trifocals, and a 60 year old pair of hands. My cartridges are 24ga formed metallic shotgun shells and they started splitting after 3.5 years of moderate use and abuse. Keep it simple and enjoy, Randy.