There is a point which you did not mention.
Several of use that reload have weighted a bunch of them and compared them to some load of loose that were thrown with a funnel top cut off type powder measure.
The results were surprising the pellets were as much as 5 grains off in the worst cases while the loads thrown with a volume measure stay with in +- 1 with a few exceptions that when to +2.
That and the fact that you can very the load more to what the gun shoots best.
For instance my triumph shoots certain load much better with 115 gr than with 110 or 120 gr.