Hey guys, im new to the site and fairly new to reloading. I have worked up several loads for my 280, and have gotten descent results, BUT... have a few issues. I have a couple loads that will put 2 or 3 shots touching, and then the next will float out about 1 to 1.5 inches. Im shooting a Prohunter and wonder if lengthining my COAL will help this out. Also, one weekend shoot a .6 group, and the very next weekend with the same load, shot a 1.6 group! The temp was around 12degrees warmer but im not sure if that did it or what. anyways.. Thanks in advance!!