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I'm not saying I know the answer but the trim length for the 300 whisper always seems somewhat mysterious. It is nice to know if you have a barrel from M1S that the length should 1.4". Curiously the recent article in the American Rifleman which makes special note of using dies only approved by SSK Industries (J.D. Jones) listed a trim length of 1.4" also and not the 1.355" you note from JD Jones.
I just reviewed data I have from Sierra and they note a trim length of 1.355" and max of 1.365" while Accurate powder lists trim length of 1.35" and max length of 1.365".
What does it all mean? For me it means I am going to get a case length gage from Sinclair and find out what my Pacnor chamber is cut to.
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