Well, 2" at 100 meters is not bad at all, well beyond the specs.
You might be able to still improve that, but it's already a good result.
I might take my No. 4 out one of these days and try it at 200.
Never done it before.
A guy shooting in my same range was among the best 3-4 shooters in the North-East of Italyicon with a Long Branch last year.
Consistently at that level, but at 200!
I have his reloading data;-D