I just purchased a Browning BPCR Rifle in 45/70. I've tried several loads in it, but haven't found the right one yet. I slugged the barrel with a 360" cast bullet and found that all of the rifleing shows up well, but contact with the lands is only 3/4 of the way around the bullet. Is this normal and will the bullet expand enough when fired to seal up? Thx in advance for your help.