RE: 3/4 inch groups ?
Some sets of arrows are not capable of groups smaller than 3" at 30yards , or even 15 yards , spothog did a test with a dozen arrows they thought were good and they groupd a socerball sized group at twent yards , and thats out of a machine . With time and practice and alot more practice , and good arrows , proper bow fit , groups like what Roland have sugested are very good , for an acomplised archer , 1 inch per 10 yards , or 3" at 30 yards is dead on .