I agree with everything said above except, IMO, you seem like a professional to me, or at least from my view point. Past that, ditto, ditto, ditto.RAJBCPA:
After using my Dillon RL550B for over 25 years it has proven to me its ability to give duplicate drops of powder every time. Consequently, I set it then check it a couple of times in the first ten drops of powder then never check it again for an entire reloading session which is often a couple hundred rounds.
But..... I use mostly spherical powders or very small grain powders and only occasionally short cut extruded powders. Even then some powders don't meter well at all and for them I use a Redding BR-30 manually on an adapter on the powder die but that is only one or two calibers of my over 30 different calibers I reload for.
I will never suggest anyone else do it my way. If the book says check the powder drop every 10 rounds then that is what I will suggest. If and when you get confidence in the Dillon powder measure then you can do it any way you want.
As an aside, reloading experts (that is not me) from testing have found that exact measurement of powder to better than a couple of tenths of a grain are a waste of time.The uncontrolled variables in reloading swamp out any advantage of measuring powder to much closer than a couple of tenths of a grain either way from nominal.
Good to know. I've only been loading with my 550 for a year and feel it best to check myself. Not necessarily the Dillon. I find that if I take a short break. The load will be a little off but is back on by the 10th charge . So I'll usually drop 10 then start loading again. After checking of coarse.I do exactly like LD, I trust the Dillon absolutely. I check the first few drop to make sure I have the right amount set, then I run with it.
I did a little test the other day when I was loading up 9mm. I was using Accurate #7 powder and I ran the loads until I could not see the powder in the powder drop hopper. I reloaded all I intended to then I kept dropping the powder into a case and dumping it back into the can (to clean out the powder drop). I would drop a couple then weigh one. They stayed at 8.0 grains until the last bit of powder was gone, the next to last drop was 8.0 grains and the last drop was 5.4 grains and the hopper was completely empty. I have always been told that when the hopper gets pretty close to empty, the amount of powder that drops will be inconsistent, I now know is the not the case with the Dillon.