AlaskaHunter
Well-known member
Carbon residue in necks can act as a lubricant but may also increase variation in seating force.
For example, in a study of carbon built up inside the necks, the average tensile force progressively decreased in uncleaned cases from 103 lbf for once shot cases down to 74 lbf for three times shot down to 43.5 lbf for ten times shot cases.
The variation in seating force may be substantial. For example cases that were not cleaned (fired 1X, annealed, bushing die) had a standard deviation of seating force of 19.0, while cases that were fired 2X, annealed, cleaned and dry lubed had a standard deviation of 1.4.
source: https://www.ampannealing.com/articles/42/annealing-under-the-microscope/
For example, in a study of carbon built up inside the necks, the average tensile force progressively decreased in uncleaned cases from 103 lbf for once shot cases down to 74 lbf for three times shot down to 43.5 lbf for ten times shot cases.
The variation in seating force may be substantial. For example cases that were not cleaned (fired 1X, annealed, bushing die) had a standard deviation of seating force of 19.0, while cases that were fired 2X, annealed, cleaned and dry lubed had a standard deviation of 1.4.
source: https://www.ampannealing.com/articles/42/annealing-under-the-microscope/
