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There are two factors for how 'dirty' a powder is:
1) % of burn completed during bullet travel, this would cause unburned powder to deposit residue
2) carbon and copper fouling, carbon fouling is primarily based on the gases and particulates solidifying onto surfaces as the fired gases cool, copper fouling is based on the machining quality of the rifle, bullet jacket or plating and the velocity of the round
All of these factors make for an interesting balancing act when it comes to reloading, especially for sub-sonic.
The faster a powder's burn rate tends to quickly expanding gases and very effective use of a suppressor, at the cost of volatility in high pressure curves and most will not cycle an autoloading design.
The slower the powder's burn rate tends to continue to burn propellent into the gas systems where the gases then begin to cool and harden, as well into and thru the suppressor, if used.
Many on this forum can attest to the ultimate in quiet use, you would have to go bolt action and keep to the faster end of the spectrum in powder, at the cost of rate of fire. For rate of fire, the inverse is true.
I would have to whole-heartedly agree, in my experience, that for accuracy, cleanliness and cyclical dependency...VihtN110 is best, if you're willing to find the right combination of components for both reloading (bullet, case, primers, powder weight/velocity, etc) and shooting (buffer, buffer spring, barrel length, gas port position, etc).
If you're more into volume shooting move to AA1680 or IMR4227 for dependency and allocate at least a bit more of your shooting time to cleaning.
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