I've had a Dillon 550 for over 9 years now. I won't trade it for anything. Saying that, it's pluses are it's durability, accuracy (Forget the claims about singles over progressives. I reload 250/3000 Savage that'll shoot 3 shot, 100 yard groups of 3/8"), the accuracy of the powder measure, auto primer feeder.
The improvements would be a scale on the powder measure to get the charge close.
If I set the powder charge at 32 grains of Win 748, it never changes. I'll check every 5th case and get exactly 32 grains. Do not use IMR powders in a Dillon powder measure. The cylinder shaped IMR powders shear off in the measure and will gum up the powder measure's slide. But then again, I've had so much good luck with Winchester ball powders, it's all I use.
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