100 evenly spaced hits in 10" is good. More is better. But at some point, more is redundant, because it's already good enough to kill every turkey you hit. Is an even 200 better than an even 150 in 10"? Not really, because the turkey is already very dead.
An even 15" - 20" circle, (as opposed to an even 10" circle), is even more awesome. Because now you have some forgiveness for being a little off center at the moment of ignition. Things happen.