I was in a pawn shop the other day and there was a 700 Remington with a Pac-nor barrel on the shelf. It was a 300 Win necked up to 338 according to the shop owner. I can find next to nothing on this round in searches. I see Pac-nor has it listed under their Wildcat chambers. Does anyone have any info on this thing? What kind of gains over the regular 338 mag? Thanks.