What can I expect when grinding gluten free grains?

I'm currently using the dry container of a Vitamix to grind grains and seeds into flour. I'm saving to buy a grain mill, but I want to know that my expectations aren't too high.

Most of my flours turn out gritty with the Vitamix, and my baked goods have a mild cornmeal-like texture. Can I expect a grain mill to produce finer flours than the Vitamix? Or am I destined to have this texture in my baked goods if I want the whole grain?

With the Vitamix, amaranth, teff, and millet seem to be the worst offenders when it comes to grittiness or a sandy texture. Buckwheat and sorghum produce a better texture for me -- more like cornmeal and less like sand. Any advice or experiences with using these particular grains for making flour and then baking with them?

I find adding a little extra water and leaving the batter or dough for a while before cooking to let the coarser grain hydrate fully helps with final texture.

I recently got a hand crank wondermill junior. Oats and buckwheat grind up very fine. I can get them like cornstarch if I want. I haven't tried teff or amaranth, but millet is pretty good, definitely way better than cornmeal. I've had a hard time getting chickpeas as fine as I like - but I like chickpea flour very smooth, like cornstarch. Lentils are easier.

I kind of like a slightly coarser grind for most things, so after playing around with it the first day I haven't really tried for super fine. Even with a kinda cheapo mill like mine, it sounds like I get better results than you do with the vitamix, though.

I haven't milled every grain in a grain mill, but on the fine setting of my electric I get nice fine flour from everything I've tried. Oats by themselves don't go well on the fine setting, so need to be mixed with other grains, or done on a medium setting.

Good to know, thank you both! A grain mill has moved up higher on my wishlist. Sounds like it'll at least be better than the Vitamix.

I did it! I bought the Mockmill 100. BIG difference in flour compared to the Vitamix. I haven't tried a low moisture recipe like cookies, but the muffins I made this morning weren't gritty at all.