Those of you who have experience with 475 JDJ or 475 GNR in rifles/carbines -- 45-70 brass blown out to .475-caliber -- what are your experiences? Cartridges of the World comments that the cartridge is significantly more effective on game than comparably loaded 45-70s. Apparently, this cartridge class was first intended for T/C Contenders rather than lever action rifles. A conversion from 45-70 would appear to be simply a barrel rebore/replacement. The cartridge should be equivalent to a 475 Linebaugh on steroids. But this isn't a particularly useful sentence.