Also if you use fiber wads in a sleeved gun you will get a poor gas seal and blow by of gas with decrease performance. Plastic wads may seal enough but felt wads will not. Some shooting venues are requiring fiber wads instead of plastic wads.
Jon,
Are you using the term "sleeve" to mean a barrel length change, or any type of insert including the chamber length inserts? I have been concerned about the wad sealing properly with chamber inserts, but had assumed that a full length sleeve would eliminate those concerns.
