Quote Originally Posted by thermaler View Post
The salesman--who also reloads--told me it's a question of matching slower to faster powders depending on barrel length. Is this true? This sounds obvious--but I don't recall reading that anywhere.
No, it's not true. Powders that give the highest muzzle velocity in a 26" barrel also give the highest velocity in a 24" barrel. The 24" will sacrifice a bit of velocity but changing the powder type or charge won't help.

Faster or slower powders are chosen based on bore diameter, case capacity and, pressure limitations of the action.