I was perusing the Lyman Cast Bullet Handbook for a load suitable for a Lee 452-225-TL boolit and noticed that for every boolit listed the max was 5 grains of Red Dot. Boolit weight didn't matter.
Soooooo……...I'm going to use Red Dot at starting loads up to max of 5 grains to see what the pistol likes. Just found it to be interesting.