Depending on the type of design,speeds can vary.Most likely anywhere from 160-190 is pretty much normal.Ranges are up to the archer.If your accuracy drops after 15yds...keep your shots under 15yds.I shoot carbons and aluminums off my recurves and longbows...mostly carbons,with 125gr Stingers.I also prefer a leather-faced tab.Some shooters like gloves.I feel I get a better release with a tab.
Form is very important also.A good consistant anchor,release and follow-thru will lead to accuracy
It's also ok to leave your bow strung IF it's a glass-backed bow.If it's just a solid wood bow with no fiberglass or laminations,unstring it after your done shooting