Hi Jim,
Think your 99 243 has a 1 in 10 twist barrel. Sierra makes a couple Game King bullets that should work in it.
I just built a Stevens 243 with a slightly different twist and started with the Sierra GK 1530. It's a 85 grain BTHP. During my research, this bullet was recommended more than most. Sierra also has a couple 100 grain bullets that might work well, the Pro Hunter 1540 and the GK 1560. Also heard good things about the Hornady VMax bullets.
You might have trouble stabilizing the longer bullets that are over 100 grains.
Good luck,
Dana
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