Paul, it seems like the different components in Promo settle out. You can weigh a new lot without mixing, start using it, and when you get low in the jug, the weight changes. It's happened to me and others have commented on it on Trapshooters.com in the past. Also Promo seems to vary from lot to lot quite a bit more so than Clays or Clay dot.
Also, I've switched from Claybuster wads to Downrange wads. Years ago I had so much plastic in my chokes that you could peal the plastic with a knife blade after only a couple of hundred shots. They probably had a bad batch of plastic but it was enough to make me sour on Claybusters. Have you ever had your wad seating ram snap when the wad goes in? It's due to the dry plastic Claybuster uses. OEM wads don't do it and neither do Downrange wads. Only drawback with Downrange is that they don't have the distribution network that Claybusters have so you may have to have them shipped to you if a distributer isn't close by.
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