That's great. I'm not sure my brother would let me convert that rifle to a cast bullet rifle now as he owns it.
For shooting jacketed, the case neck expansion would be excessive, I'd think. Now, there is only 1 1/2 thou. allowable expansion when using a .367" bullet. Most case necks only expand .0005"(1/2 thou) with the current loads in this tight chamber and 0 expansion to 1/2 thou above the web. from FL sized.