I load 200-gr bullets in .45 acp with 6.0 gr of Winchester 231 and I find them to be very, very light loads. 5.9 would be even lighter.
Take look at WAP load data. If 5.9 grains isn't too much for your bullet, then you'll be fine shooting these no matter which of the two powders is in them.
Take look at WAP load data. If 5.9 grains isn't too much for your bullet, then you'll be fine shooting these no matter which of the two powders is in them.