Traditionally, 2400 was the go-to powder (Ala Elmer Keith) for magnum loads in the .44 Magnum, Unique for target loads. He recommended using standard, not magnum primers despite the fact that 2400 (the '60's version of 2400; I do not know if they change it), always left considerable un-burned powder on the ground.
Sometimes you get what you pay for, sometimes you only pay more for what you get.
Three shots are not a "group"...they are a "few".
If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill? (Exodus 22:18)