I feel the 450 marlin will wind up just like its little brother the 444 marlin, very popular when it first come out but over the years it becomes just another cartridge with no place in the shooting community. From what I understand the 444 marlin was supposed to give a 45-70 a good run which back in the day when it came out it would have, But no prevail now today with the 450 marlin, Marlin decided they were gonna surpass the the 45-70 rather than just exceed it. But once again I think marlin will fail. The 45-70 is unreplaceable.