Arrowheadrifles uses .458 barrel. Can anyone tell me if hankins use a .458 barrel also? I built one for my brother last fall. Hankins prefit. I size bullets for this rifle. I'm considering buying one from Arrowheadrifles.com. I'm just wondering if I can use the parker ballistic extreme it. I just don't want to buy a barrel and have to use different bullets. Thanks.