He has successfully BTDT. If I were pursuing a LR outfit the 6.5 SAUM is where I would start. Magnum Man
Yep, always best to start with a wildcat cartridge that requires sizing down, fireforming and neck-turning. Especially one that starts with currently unavailable brass.
Of course the 6.5 SAUM is bad-azz, but it appears to be a logistical nightmare.