Yes very very true, always take others powder charges with a grain of salt and always work up from a few grains lower. Brass, chambers, throat lengths, powder lots, and even actions in some cases can affect where you will find excess pressure.
I was using new Winchester brass.
And i agree, i am also going back to 162's in the 284, mainly because of the twist of my barrel. (Standard tikka barrel) The 180's shoot mint at shorter ranges, but the stability is marginal out at 1000 yards. So i'll stay with the 162's in this barrel.
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