The action used in the Rem is the same as the Mark X and Whitworth series rifles (Yugoslavia) and they are fine rifles especially the Whitworth. The more you use them the better they get. And as far as the Ruger question above, which model early or later? Early 77 458's are push feed guns for those that care. I have owned a Whitworth .375 since '84 and its always been 100 percent reliable and verrrrry accurate. Its the one I took a buffalo with one shot with.