4759 Clone

[1Shirt]

Has anybody tried this in a 375H&H with 250 gr. cast? I tried it with 40 gr. under 250 gr. Sierra BT, and 375449. Got 1 1/4" at 100 with the Sierra, and keyholing at 50 with the 449. Will try backing it down some with cast, but am interested in satisfactory loads with this powder that might reach into the 1700-1800 fps range.
Thanks in advance to all who respond!
1Shirt!:coffeecom