Just a thought: The tighter you make the barrel twist, the less performance you will probably get out of lighter weight bullets. My 1 in 10 does ok with 147 gr. M80's, my 1 in 11.25 does a little better. My pocket book tells me I will shoot a lot of M-80, if for no other reason then to get the brass for reloading. Going to 1 in 9 might rule out using the cheap stuff for anything but plinking or mag dumps. Maybe some of the more knowledgeable guys can weigh in on this.