i have consistently gotten a velocity increase of 110-170 fps with powder coating. .30, .452, 454, .458, .41,.44, .357. are the cals i coat.
i use white for powder puff loads, yellow for mid range and red for lull power loads. makes it easy on an old phart to get the right load for the use.
i have also gained accuracy in the 458's and the and the 454's in the heavier weights.

the consolidation of the states into one vast republic, sure to be aggressive abroad and despotic at home, will be the certain precursor of that ruin which has overwhelmed all those that have preceded. Robert E Lee
~Molɔ̀ːn Labé Skýla~