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Well, IMR 4895 has been around for a long time. Some of those older powders used more deterrent, anti-flash and other coatings than newer ones. So it's really no surprise that they might also be "dirtier" than some others.
Powders that were developed for military use (like 4895) might have properties that were less important to us than to the Army. And other attributes that the Army was less concerned about than we might be. Cleaning ease might be one of the latter.
That said, 4895 has a lot going for it. It's a single-base powder that is very consistent and predictable as pressure go up during load workup. I burn a lot of it for just that reason.
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