The Mighty Prawn Posted January 3, 2021 Author Report Share Posted January 3, 2021 Just checked the Vihta load data and they only list the Hornady GMX not the SST but both are the same weight and Identical BC so should be interchangeable? They have min load 39.4 and max 43.5 so I am overcharged - probably saved by mine were 2.82 COL and they state 2.795 so I think my pressure would be slightly lower as a result? Will make some up to their recipe and see what happens. Quote Link to comment Share on other sites More sharing options...
phaedra1106 Posted January 3, 2021 Report Share Posted January 3, 2021 (edited) Always check the powder manufacturers website for the latest data. Powder isn't just ran off a machine and into a bottle, they make massive amounts in batches. These are bulk stored and dip tested at regular intervals as the chemicals alter slightly over time. Any changes to the burn rate etc. are noted and their published load data is adjusted if required. Reloading books data can be several months old by the time they're published and bought, some haven't been updated for years. Edited January 3, 2021 by phaedra1106 Quote Link to comment Share on other sites More sharing options...
London Best Posted January 3, 2021 Report Share Posted January 3, 2021 You should worry that the pressures are excessive when the primer flattens enough that it has no chamfer remaining visible around it. Quote Link to comment Share on other sites More sharing options...
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