I've used some over the years. I gave it away after I noticed that some of it didn't have a relief cut above the rim, rendering them unusable in my P-14's.
Military .303" did not have the relief cut above the rim. Has your P14 been modified?
This is Match Grade brass made for the original Herters company in Sweden (Norma iirc) Higginson Powders was selling it but it is now all gone.
imho, it is too good a quality to waste on "plinking use"...



























