I'd go to the 240 for deer too, but you can spice up that long seated 300 a good bit over 19 grains of H110 when you want to pop a big hog or whatever.
Unlike the small percentage difference everyone gets all atwitter over when stretching the 257 Roberts to 3" long, lengthening a 44 mag round by .130" or so really does appreciably add to the ballistic potential.
