I have been going thru a slow time waiting for knee surgery and I came face to face with a 375 action. Never wanted one but the bore is perfect and it would be the biggest challenge of my self taught metal working. It has no bolt, but I am not put off from the challenge. The only issue is I have no desire to shoot smokeless powder. Is this cartridge good with pb? I would think it us, but what do I know?? What say ye?