Hsmith,I have had the same experience with h335(very fine).I have heard graphite can help it keep from leaking,,Don't know for sure but I don't need it with h4895.I use only h4895 in my measure, and I believe sticking with one powder can help with consistency because my measure is spot on when I check it.Some day I will have to try another powder to prove to myself one way or the other.
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