I see alot of comments about not liking a powder or not being able to get consistent drop accuracy(really precision). Ive diced around with this issue both in rifle and handgun loading and have found a few things that help get consistent reslts. Use of a baffle is pretty much required for good results. Larger measures come with them. I use a RCBS Little Dandyfor most of my handgun loads. For a number of reasons. First the rotors use a small diameter hole for most loads. The smaller hole lends to constant results because you "wipe" less area when dropping charges. Secondly I can pick it up and just run it over a loading block and not have to finagle a block under the bench mount measure Speeds up the process and lets me see whats in each case.
Now the rotors are fixed in size but I make "freeze plugs" to press fit into the boring and fine tune loadings. At least this makes them more versatile. Another tuning trick is the number of taps you make on each drop. Each tap will add a bit more to the amount the chamber drops. As a general rule 4 taps will give the most consistent results even with the Battle Creek cornflakes of 800X. I check randomly as I run thru a series of powder drops and the 800x will stay within a 0.1gr., but dont vary your technique.
I dont thik you have the flexibilty with a progressive loader just due to the need for synchronization, although Ive heard of people dumping individual charges thru the powder die position. A little experimentaion with techniques can give you a good increase in the flexibilty of your measure.
I have gotten so use to hand weighing my charges to precise to level the scale over the years it doesn't bother me to continue to do so!
I use the RCBS Uniflow to drop an exact or slightly less than level charge in the scale pan then trickle to level the scale, one or two kernels of stick type rifle powder or a few kernels or flakes of pistol or ball type powder powders...
I hope you A-fib is staying in remission. If it doesnt kill you it sure is a %^& nuisance. Had a maintenance chemo change which retriggered it. I feel like an old car some days.