Shot a round of Clays with a friend who used his O/U & factory AA shells, he said they were 1325 FPS. I used my Trojan & 2 reload recipes 3/4 - 7/8 powders 20/28 & Unique all in AA hulls. Velocity little over 1100 FPS
Sorting out empties yesterday was struck by how clean his hulls were. Not a spec of powder residue inside the hull. My Unique loads are always very dirty, 20/28 less but still dirty. Seems to me some powders burn clean others dirty , real difference in how clean a load burns is pressure. Higher the pressure more complete combustion . And we always look for low pressure loads
No doubt holding pressures down contributes to dirty bores. Easiest way to clean is spray some solvent, I use Balistol, and let it sit overnight , next day one pass with a cut down blue shop towel wipes most out, 2nd clean patch bright and shiny.
My opinion, worth what it cost.
William
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