There is a reason that load data varies from manual to manual, that is because of the variables in rifles and in components. Barrel and chamber dimensions vary considerably from rifle to rifle, and powder can vary from lot to lot. The powder that produces the most velocity on one rifle, may not produce the most velocity in another rifle. A powder that produces accurate loads in one rifle, may not be accurate in another rifle. A load listed in a manual, may not even be safe to use in you rifle. Look at several manuals, then use the data as a starting point to begin your load development.
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Only accurate guns are interesting.
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