Originally Posted by Cutty
Working up some loads for a 6mm Rem carbine with a 17 3/4 inch barrel. Should I use a faster burning powder than normal because of the short barrel? Suggestions for bullets, favorite loads?
No. There is no reason to go to a faster powder!
General rule of thumb is that whatever powder produces top velocities in a standard length barrel will also produce top velocities in a shorter barrel.
It's pressure/time curve that derives velocity, not necessarily the speed of the powder, per se.
If you go to a faster powder, the pressure/time curve is reduced, and therefore velocity will suffer, even in a shorter barrel.
If we were talking about a 12" barrel, then a faster powder would be beneficial.
Stick with the top loads in your manuals, generally the top 3 powders listed with the highest velocities will be the best choice.