I have a chance to by 60 .257 wetherby hand loads that a guy got at an estate sale and knows nothing about. Thay are in some old wetharby boxes with a pic of a tiger on it. There is a sticker that has 3/14/1967-cci mag primers-120gr sierra-75gr of h570. I will probaly pull the bullets and empty the powder just want to know if this old brass is still safe to shoot? I realize that not knowing how many reloads are on it it is tuff to say. I cant find much on this powder / bullet combo if someone with an old reloading book cood look it up that would be great.