This is a discussion on Is there a way to calculate velocity? within the Reloading forums, part of the Defensive Ammunition & Ballistics category; I guess the first question is, why do a lot of reloading manuals give a velocity for a recipe, but fail to give barrel length ...
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I guess the first question is, why do a lot of reloading manuals give a velocity for a recipe, but fail to give barrel length and twist? Doesn't that make a pretty big difference?
In this case, I used 22.6 grains of H335, hornaday 68gr BTHP bullets, and a 16" AR15 with a 1:7 twist.
Is there some online calculator that would spit out a velocity, or does a guy have to pony up for a chronograph? (which is on the to do list).
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In a word NO! You need to realize that every bbl is a rule unto itself. You need to chrono. Reloading is not about guessing! Chronographs are cheap enough, buy one or borrow one. NEVER GUESS!
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Sure...a chrono would be a good idea. I'm trying to remember, but I think some of those variables can be plugged into the Lee Shooter program. I haven't been able to find mine since my last desktop crashed a few years ago, and don't have it installed on this one. You can do some searching here to see what's out there-
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Be real and get a chrono! Use a 22LR rd as control, and actually chrono your loads.
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