I don't shoot 240 gr bullets or boolits in my 444s. With heavier hard cast--IMR-4198 and RL-7 always worked best for me and for many others on MO. I would grab the Lymans cast bullet manual and take a look. Unfortunately mine is at the house and I am at work. I would be very careful with using IMR-4227 since its a magnum pistol powder. Not that it can't be done---but I wouldn't use it until finding some real world published loads for the Triple-4.