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).