Was using 85 grn Sierra bullets with ( a worked up load of ) 42 grn of H380, and it was a superb load - IN MY RIFLE...
However, one day I picked the incorrect box of bullets from the cabinet, and loaded 100grn bullets with the same powder load. I walked away from the firing of the first round it with a bruised right jaw, and a black eye, and a note to self to double check everything before the components are reloaded.
Good bullet, and good powder, but only needs small increments to change performance. I now use IMR 4350, for the .243, and am finding that a excellent powder aswell.
FOR THE 100GR WITH H380 POWDER BOOK SAYS LOAD
MIN 32.8 VEL 2600 TO 35.3 VEL 2700 ?
****IN MY RIFLE H4I4 POWDER 41gr IN A REM WITH A BORDER BARREL 24" barrel coal 2.271 my load so prob not any good for you .CC1 PRIMERS 2990 VEL.*****
The book says .the best loads with and tested were with
Fed 210M primers
TWIST 1X9 1/8"
COAL BOTH @ 2.650"
100GR #1540 FBSP
100GR #1560 BTSP
ACCURACY LOAD @ AA 4064 POWDER-- 35 GRAINS----2700 VEL----1618 FL.LBS