I have found that running W231 .2 grains hotter then the amount needed to be accurate makes it burn cleaner. That is so long as you have not reached the max load. It should also stay accurate. For some reason that little extra powder makes for a cleaner burning load. I suggest trying some test rounds since you already have the powder on hand. WST burns much cleaner and will still give you accurate soft shooting loads. It also fills the case fairly well too.
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