Dont know about nitros but in my browning invector a sumtoy .685 choke with fed hwt #7 put up like 244 in the 10 @ 40. Bigger the shot the bigger the pattern in that gun. Ill be sighting in my ff3 on my h&r with the same choke and load next week. Im excited its the first time ive ever had something other than a bead for sights.
