Shilen stainless steel .223 wylde and Shilen regular chamber(2 barrels)223, you have not explained what your 223 is, or the type of chamber that your 223 has!
Built up lube in the Dies?That’s why I’m thinking it’s on my resizing
Like stated above: What's your powder charge wt & what bullet?What's your bullet, powder charge weight, seating depth BTO?
First loads are sierra 77hpbtLike stated above: What's your powder charge wt & what bullet?
It does it on low powder charge also
Over bump ?Ok I took a fired brass that I shoot yesterday, measured toward the base it was .466
Fired shoulder length 2.083
Measured the shoulder just below neck .419
Full length resized,bumped the shoulder to 2.079
Shoulder measured .416
But at the base it was the same .466?