I had the same happen to me with the 7mm RM & to make matters worse a mate did the load development for me & when i shook the bullets you could hear powder moving inside but when I did my own loads exact same brew ..compressed loads !! & I triple checked to make sure I wasn't doing something wrong , I wondered if the temperature could effect the powder , loading in a nice warm house vs a cold garage or is that just silly talk ? from memory the powder was from a different batch could that be it ?
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