have a 6ppc as most of us do, I have been struggling to get it to shoot as well as I like. In March I put on a new Bartlein 1-14" twist barrel .262" neck shooting Cheeks 66gr fb, a light load of N133 by most of you here 27.4gr. have the bullet at just touch. with this combo I have shot the best groups of my life.................until it hits 80 degrees, once the temp rises above 80 degrees it simply will not shoot. I have tried many powder and bullet seating combos but it steadfastly refuses to shoot above 80 degrees. anybody else have this happen ???? any ideas ????