Some "sparking" is normal for B/P, way more so than modern powders, but there is a limit to how much is "normal".
I'd suggest trying a different lot of powder, no oil in the chambers or on the wads & see how that works.
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Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”
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