Originally Posted by AZShooter
I have read on several occasions that the optimal powder will work regardless of barrel length. There is an idea floating around that a short barrel requires a faster powder and it is nonsense. Just look in the loading books for a powder that works with best accuracy/ top velocity and make your loads.
Rarely does a powder given the highest velocity also produce best accuracy.
Only if a loading book's load is tested in a barrel exactly like yours (same chamber, bore and groove dimensions) would I think it might be the most accurate. And then only if it was tested in a free recoiling machine rest to eliminate the shooter's errors that are always part of the group size. There are thousands of loads in print for a given bullet that's stated as "most accurate." And hundreds of ways were used to determine accuracy, too. Few, very few accuracy tests used for puglished load data are made that have high enough levels of probablility that the represent what can be attained all the time. Which one's best for you?
And if one wants their load's pressure curves to be repeatable at bullet exit for all rounds fired, they will use a powder speed correct for their barrel length. 16 inchers need different powder speeds than 28 inchers.