IDK if this still works but on some games I used to:
Have a gun with high recoil.
Search unknown
Have a gun with low or lower recoil
Search has decreased
Have original gun (one with higher recoil)
Search has increased
Have other gun(one with low or lower recoil)
Search has decreased
Have original gun (one with higher recoil)
Search has increased
Have other gun(one with low or lower recoil)
Search has decreased
Have original gun (one with higher recoil)
Search has increased
Have other gun(one with low or lower recoil)
Search has decreased
etc. etc.
Same concept with the no spread.
That is how I used to do, I am not totally sure this still works, ask longevity or dave or some1 that has been doing it recently.