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There's always a slight difference for projectiles oal. Lead tipped are the worst followed by hollow point. Plastic tips less so.
As you are doing Base to Ogive that is the correct and only way to...

I've got the old Stoney Point (now Hornady) comparators, Sinclair comparators and one 30 cal Whidden comparator. They all give a slightly different reading ie they are measuring at a slightly...