I just picked up a great deal on a short barrel 54cal Safari Arms {Investarms} Hawken style and it will be a while before I can get out shooting it. What can I expect diferent with the 22" barrel from the long barrel models? I want to dedicate this one for bush hunting shooting maxi conicals at no more than 70 yards. Will the 22" barrel need a powder reduction from what the 28" barrel uses? will I be loosing a lot of velocity with the short barrel ?