I know what you mean about the the convienence thing, but I think you will actually like the loose better. If you are a target shooter or your accuracy is important you will achieve both better with loose. To me the biggest issue is still the tremendous cost difference between pellets and loose powder.
If you weigh each of those pellets on a powder scale you will be surprised the variance between them. And I know that +/- a few grains is not suppose to make a big difference, but...
I know several people that have poured the volume, measured the volume on a powder scale and then use the scale to drop all of their loads in their speed loaders. I actually use the brown plastic medicine bottles you get prescritions in, they are water proof and UV proof - make great powder containers. I went to the local pharmacy and bought 50 of them.