Plastic wads shoot tighter than fiber wads in the same gun. Fiber wadded shells tend to leave lead in the bore as there is no shot cup. My preference is plastic as the bores are easier for me to clean. OMMV. Roll crimped vs. star or "pie" crimped: Some loads may be taller in the column and a star crimp might not completely close allowing shot to escape. The overshot card of a roll crimp solves the closure issue. Roll crimped loads have slightly lower pressure than the same recipe in a star crimped roll. RST or Polywad loads are low pressure when indicated regardless of crimping style. In the Polywad Spreader loads, what appears to be a roll crimped plastic overshot card is actually a "tee" which helps spread the load. Good luck. Gil
