I bought my first 243 a couple of years ago, and discovered that I couldn't make a bad load for it so far. I threw darts at the reloading manual and came up with 40 grains of Varget under the 80 grain Ballistic Tip. It makes a fine red mist when used on prairie dogs, and went all the way through an antelope on a broadside shot at around 300 yards this year.
Royce