from what i have heard or read , yes there might be a change from field tip to broad head, i have been lucky in my set up my broad heads shoot just like my field tips, but not everyone is that lucky. i would suggest, like the other people have , practice with the broad heads , practice practice practice. and as for which kind of broads , dont know what your regs. are there , but you might wanna check with the local fish and game to make sure as to what you use, such as mech. broad heads are not allowed for big game here in idaho. i use muzzy 100's 3 blade, so far they have done an excellent job for me on everything i have shot.