I have noticed that the 142 seem soft and if cases have to much neck tensions they will deform in the seating process, I found that they like (in Lapua brass) to have a OD neck size of.293 or greater the .295 bushing will give .0025" of tension and seems to produce the best groups in my rifle.
All guns and case lots are different but this was the findings I have found so far. Also be careful with compressed loads they to can cause bullet deformations(more than with the normal AB ). Example is the max load of retumbo would be 58 gr but my cases are full to bullet deformation at 57 great and I am using 56 and getting great accuracy. Will post more as I find velocity true BC in my rifles ect. .
Last edited by fredIII; 06/14/15.
