musketman59
The .458/275 grain Lehigh is shown here with some of the rest of the line. The Lehigh, Gm54-120 talked about, is a .458/277 grain is not pictured but basically the same bullet as the 275. If I am hunting the early Idaho rifle season I will be using an Extreme with the 277 grain bullet.
To use these or any .458 bullet you will need the MMP HPH-.457-.458/50 Orange sabot.
If you need a range bullet to use to sight in with, cause they are way less expensive - Sierra offers a .458/300 grain bullet for a lot less money.