kilotanker22
New member
That is a good point Bart. One that I knew was true, but also a point that does not get thought about often.
These results make me wonder if whatever was in that seating stem was throwing off my concentricity and that was the cause for going from .25-.3 moa up to 1 moa?
Interesting. I really do not know what my problem was now. I guess it is possible that there is something I have over looked. I did take the die apart and clean the entire die when I removed the seating stem. After which the problem went away. I will continue to check for that problem and see if it returns. If so, maybe I can find the cause.interesting. After reading this I took my Frankford Armory seater and used a bit of hot glue to stick a piece of brass shaving into one of the seating stems to try and duplicate your theory. With ten dummy rounds it caused the base to meplat measurements of the loaded rounds to be off by .001 - .002. After pulling, the bullets base to meplats turned out to be off by .001 - .002 which leads me to believe that the seating stem was hitting the meplat rather than the ogive of the bullet. Concentricity was not affected at all however, and all ten measured within .0015 or less.
Nice three shot group however, and it is good that someone can get those 145's to group
Nice three shot group however, and it is good that someone can get those 145's to group
my distance to the lands is varying by as much as .008".
there is a point at seven shots, beyond which increasing the number of shots increases the likelihood of getting an outlier more than it increases the "typicalness" of the group, skewing the results. To get the most information from group diameters in the fewest total shots, fire six or more seven-shot groups and average their diameters.