If I were you, I would use the lowest charge that was accurate and met the power factor you are seeking. If I could go to 6.8 or 7.0 I would. 44spl is a pretty low pressure round, so leading shouldn't really be an issue even near max... if you do it right. Are you using pure lead or hard cast? Did you slug your barrel and order the appropriate size projectile?
What you saw is probably not leading, but without a picture no one here can say for certain.
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