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I've been using Dillion presses for about 35 years now, and usually, I use the Dillion powder measure on the press. Using ball and spherical type powders, I get fairly consistent weights that have given me enough accuracy that I load a lot of my high volume 222 and 223 P-dog varmint loads on them. Also years ago, I used a Dillion 550B to load a lot of my NM comp loads, 5.56 and 308, and I received very good accuracy. Enough that I made High Master using those loads.
I adapt a Hornady or Uniflow powder measure with a Hornady Case Activated Powder Drop. I use TAC powder a very fine ball powder, it leaks, no it rains TAC from the OEM Dillon slides. Without jumping through hoops, buying and lapping aftermarket slides to the Dillon , which I'm not willing to do, BECAUSE I F'N HATE DILLON POWDER MEASURES. The Lincoln Log IMR4064 doesn't do well in the Dillon PM either.
Guess I've been lucky, not using those powders in the Dillon. I have two of their PM's and polished out the funnels till they're like mirrors, and added a better metering baffle and they feed great. I will say that the powder slides I got with the 550B in 1999 were IMO better than what you get now. More finely machined and fit tighter. But then I'm only using a few powders in mine, and nothing for rifle. I tried the spring return, but it was more jarring, not less I thought. I added a micrometer to the powder bar which makes for easy changes. I have four toolheads and two Dillon PM's so wish I had been your neighbor when you were tossing them, LOL! I have the Entirely Crimson QD setup though, so it takes only a minute to swap them out after dumping all the powder of course. For rifle I use a Redding 3BR which is way better than the Dillon for day to day accuracy and consistency.
I have to hand prime everything going thru the 650, the priming system is pure GARBAGE. Dillon finally figured that out themselves, hence the 750. I've been reloading since 1976 and I enjoy(ed) it until I got the 650, I'm surprised I haven't beaten it to pieces with a baseball bat. The bastards nickel and dime (ACTUALLY $50 & $100) for everything. And that "legendary" warranty I haven't seen it. Support sux too, I just hate F'n with the thing.
My 550B primes perfectly, really. I got the aftermarket moly coated primer support plate from UniqueTek which helps, but honestly it did a good job for years before that upgrade. They've also been good to me on their "No BS" warranty, sending me a bunch of spare parts, including a couple of items they were supposed to charge me for. The last thing they sent me was a new bullet tray, because the original I bought had a finish issue.
I am a big fan of the Dillon 550 - got three. All used, picked up on estate sales or people that were upgrading. Simple. I leave one set on 9mm, one on 223, and one is 308/45 base with large primer - it does 45 and 308/CM family. I got the Dillon 650 with feeders and lots of extras super cheap from estate sale. The 650 is a PIA. Too many thinks to go wrong and - yes - primer system bites. I set it up for one caliber (223 AR mag length) and do not make any changes once it is running.
I miss quarantine!
I'd probably do more of the same if I lived in a free state, and didn't have to notify the Feds everytime I bought ammo, which I refuse to do. Especially for shotshell. Since January 2019 I've bought exactly 1 box of ammo, a 50 rd box of .357 Sig in 2020 for a CCW qualification, before I was setup to reload that caliber, and that was a PITA with the purchase first being denied, then finally approved. As it is, I kind of enjoy at least semi-permanent residency in my reloading area.
. I have quiet, a radio, my dog, a well organized 4 press setup that I enjoy (all Inline Fab mounting and storage options), and no nagging. (You married guys maybe can relate? 
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The circular primer handling system in the 650 works just fine. I prefer it to the cheap 750 system with the movable spring-loaded rod that likes to jump off the runners"
