I started to work up a load for my 300 win mag using 212 grain Hornady ELD-X bullets with H1000 powder. I started around 74 grains and worked my way up to 77 I believe. I’m at work and I don’t have my note book in front of me. I was at the range shooting at 150 yards and all my bullets did not group. They more or less started left and slowly went right looking like a bad smiley face. I made up 5 shots in each batch and they were all in about a 2” square but stayed in line with each other. They seemed to be slowly tightening up and maybe I just need alittle more powder to get them to come together. Is this a common problem or am I doing something wrong on my end?