Save me from burning up components to discover the answer for myself... What impact does seating depth have on velocity? Will seating a bullet say 1/100th of an inch deeper have a noticeable impact on velocity? I'm speculating that a deeper depth will increase pressure??
Seating depth and velocity
- Thread starter SABuzzard
- Start date
Seating depth is adjusted to aide the bullet in finding the lands consistently round to round. Starting from the lands the pressure will increase, then decrease, then increase again as powder is compressed. This is as you shorten the OAL from touching the lands down to min SAAMI specs. The velocity will increase at those times, but not a good way to manipulate speed. If you want to go faster, change powders and bullet types, but remember BC trumps velocity.
Good info. Thank you!
It was more of a question to potentially explain velocity differences in batches of ammo that used the same components and same powder load, but had slightly different seating depths. The combination of powder and bullet put it close to case capacity. So it very well may have started to compress the load as the depth increased. Anyway, I'm with you... not a good way to manipulate velocity.
Ok I understand. Yes the standard deviation or spread can be related to seating depth, and tolerances of: brass thickness, the powder scale accuracy, if you are running a compressed load did you use a drop tube, and so on.
Similar threads
