I'm @ 46.3 of 2209 lapua brass and it's putting 140 amax on top of each other. Sierra are always accurate as too.
I've never bothered pissing around with the brass (OTT)if new I just fire it and then full length it or neck size it after that. Keep away from higher loads till you know it's safe mate. Start around 44.0 of 2209 and stay around there, I bet it's accurate as.
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