I have always wanted a magnum 357, I have owned a 257 (still have one) and they are fantastic sideband radios. The clarifier is unlocked from the factory. The old models had a rejection problem like the magnum deltaforce but the newer models (one I have) does a fine job. Cb World Informer had a really good article about the radio. They have less features than a 2950-70dx but performs pretty close. As I understand Magnum gave up on the radio due to lack of sales, I don't think RF Limited makes them for Landmatic although I could be wrong. The remote amp is a nice feature, direct keying from the PTT, ALC controls the finals. Maybe next time I see one for sale I'll have the cheese to buy it and try it out.
Newer 257's have a jumper board to set up the frequencies. One position does 10M only, next is CB only and then bands a-? it's got alot of channels.