Bought some RC Powder and loaded 7/8 according to published data at various velocities. Lots of issues with unburned powder, weak loads, really bad smell. Guns were the dirtiest I have ever seen by far. Not a loader problem as my Spolar has done 100k with no issues. Winchester 209 primers worked fine in other loads. Charges were weighed and were correct according to the published data. Any ideas? Thanks.