The heavier the bullet is, the less powder is used.

So shooting a 150 grain bullet with 158 grain data, any adjustment would be an increase in powder. Not making any adjustment would be safe and you could work up the load from there.

If shooting a 158 grain bullet with 150 grain data, any adjustment would be a decrease in powder. Knock off a couple tenths of a grain and work your way back up.

I usually ignore plus or minus 5 grains in the bullet weight. If the load is not near max I might ignore that altogether.

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