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And more important, what is the best criteria for judging whether data is reliable (read safe) or not?
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You are!! That is why we always say start low and work your way up. Lyman 49th is a good reference book because it is not specific to any one manufacturer. I use my books in this order.
1. Bullet manufacturer's information and load data. (it is specific to the bullet I will be using)
2. Powder manufacture's information and load data. (it is specific to the powder I will be using and I get as close to the same type and weight bullet)
3. When all else fails, I go to Lyman's and try to match the bullet type and weight as close as I can to the powder speed I will be using.
Start low and work up your loads and always check for over pressure signs.
Jim