You don't mention whick hull your using. The only time I'll substitute a hot primer for any load is in the winter when a hotter primer helps with low pressure loads. I wouldn't use a magnum primer with 1 1\8oz. loads at anytime.
I found 2 identical loads with Titewad powder in 1 1\8 target loads. 1 used a Win primer and the other used a Fed primer.{hotter primer}
It generates 1,800psi more chamber pressure just changing to a hot primmer. The magnum primers are generally used with slower burning powders with heavy field loads.
If you want to use the CCI 209M primers, find a recipe that uses Fed 209 primers and use them that way. Your load is already over 10,000 psi now I'm figuring. Don't use those primers with your recipe.