Anyone out there have any experience with the 7mm International Rimmed cartridge? I may do a trade for a Contender Barrel for a 7mm International Rimmed but there is not much info out there on this cartridge. Case forming, load data, dimensions. I am trading a 373 JDJ to down size to something less violent to shoot but not sure if I want to go with the 7mm. What is involved in the case forming for it?