Originally Posted by fredj338
Where exp comes in. When I am going to a new bullet/powder or calibner combo, I use avg book data & work up. Using a chrono, comparing vel to book data, modififed for bbl length of course, it's a safe way to work up loads w/ no guessing involved. Like data manuals, LQ is another good tool, but not to be trusted as the final word.
Velocity "Modified for barrel length", How much for each inch of barrel? Is this the same for rifle as it is for pistol. Where did you get your "Modified for barrel length" number? Is there a hard and fast rule for this or is it an educated Guess?
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