Growler215
Ultimate Member
Cleaning barrel between powder changes?
After reading a thread on accurateshooter.com, I'm curious what the MDS concensus is (or if there is one.)
]https://forum.accurateshooter.com/threads/load-development-question.3935808/#post-37069135
Some folks said it was important, some said just a wet-then-dry patch to remove unburnt powder residue, some said only when switching between ball and stick, some said only when switching between powder manufacturers, and some said no, are you crazy?
Part of what is sparking my curiosity is I'm doing some subsonic load development for a few sbrs in different calibers. Since there isn't much room for charge weight tweaking once you've found the charge weight that gets you the velocity you want when loading subsonic rounds, I'm trying out 6 different powders (3 ball, 3 extruded) to see which is most accurate (and has small SD) for different heavy-for-caliber bullets.
I did something similar for my (18" length) .450 Bushmaster with 395 gr Sub-X bullets.
I found what seemed to be a clear "winner" there doing a shoot-off, but I was not doing any cleaning between powders. So the powders tested after the "winner" might have done better with a cleaner barrel.
After reading a thread on accurateshooter.com, I'm curious what the MDS concensus is (or if there is one.)
]https://forum.accurateshooter.com/threads/load-development-question.3935808/#post-37069135
Some folks said it was important, some said just a wet-then-dry patch to remove unburnt powder residue, some said only when switching between ball and stick, some said only when switching between powder manufacturers, and some said no, are you crazy?
Part of what is sparking my curiosity is I'm doing some subsonic load development for a few sbrs in different calibers. Since there isn't much room for charge weight tweaking once you've found the charge weight that gets you the velocity you want when loading subsonic rounds, I'm trying out 6 different powders (3 ball, 3 extruded) to see which is most accurate (and has small SD) for different heavy-for-caliber bullets.
I did something similar for my (18" length) .450 Bushmaster with 395 gr Sub-X bullets.
I found what seemed to be a clear "winner" there doing a shoot-off, but I was not doing any cleaning between powders. So the powders tested after the "winner" might have done better with a cleaner barrel.
450 Bushmaster Subsonic Load Data
I have been unsuccessful at finding any load data in the forums or in my current load books about subsonic loads for the 450 bushmaster. Specifically, a 395 grain sub-x projectile from Hornady. Based on the factory sub-x round I took apart it looks like roughly 19-20 grains of mystery powder...
www.mdshooters.com