10 inches lower, check your MV then.. probably lower pressure..
indicating too slow of a powder..

if you desire that slow of powder, I've had the best accuracy with H 1000...

think you'd be getting better groups with RL 19...

myself.. I use powders in the 4064, RL 15, Varget, H380, BLC2 burn range with 140 grain bullets..

"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC

“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez