I have a question about my new rifle (300 rum improved). I'm assuming my gain in case capacity is going to be toward the top of the case near the shoulder. With that being said, am I waisting my time with the new cartridge by using longer bullets that protrude into the case quite a ways? Or will I still be able to take advantage of the extra horsepower to push heavier bullets? I want to load my rounds to fit in the mag if that has any influence on your answers. Thanks!!!