OK I have been reloading for years and normally use a Stoney Point COl and the appropriate case.
Anyway this weekend thought I should sort out a load for my newly aquired 69 grn TMK's
So went about it as normal but for the life of me I just couldn't get any consistent readings, they were varrying by 20 Thou. Fell into two batches. After an hour of frustration I resorted to getting a brand new Lapua case, checked in a Wilson COL guage, slighly enlarged the neck so tightish bullet fit and marked bullet with marker pen and chambered a round. I did this sevearl times and got a degree of consistent readings.
Not much signs/if any at all of rifling. Could it be that either my border SS cut barrel has a long throat or is it a little shot out. Its not shot a huge ammount of rounds, probably not a 1000.
Has anybody got any suggestions?
Anyway loaded a range from 25 to 26 grn of N140 to see what they are like.
All 10 thou of what I asume is max COL. Also no issues in mag length as its in an AICS with a .223 polymer mag.