I want a barrel for antelope for a trip west next year. Since it is a contender and not an encore it seems I would need a JDJ wildcat cartridge and I am not through reading up on those but I am trying to find a cartridge that would not be too much work to form the brass. It looks like you can buy TCU 6.5 brass already formed (for a lot of $) but I don't know if that cartridge would do.

I know the big TCU's like the .375 can take big game but I don't know which, if any, are good for long range out of a contender.