UnBurnt Powder ???

[Kirk Mckinney]

Gentlemen

I wanted to ask your advise regarding unburnt powder on my skeet loads. I patterned my AE Grade Fox I plan on shooting skeet with. One load was 15 gns. of 700x with 3/4 oz. lead, the other was 15gns. of 700x and 24grams of lead. When I got home I looked down the barrels and it looked like there was some unburnt powder on the insides of the barrels. I know a clean burn is better but is this something I need to address or ignore ? Will it hurt anything ? I had both loads tested at precision and the psi and velocity were fine. At least it looked like powder flakes that didnt burn.
Also the 3/4 oz. load didnt look near as impressive of a pattern as the 24 grams. I only shot 2 rounds of each load, one down each barrel ) to pattern. Is this enough to be considered a sufficient test ? These loads are in a 2 1/2 inch cheddite , 12 gauge

Thanks for any input.
Kirk