.500 Linebaugh all the way. I am a huge fan of the .45 Colt, but the .500 Linebaugh is hard to beat. I have found there is little 525s at 1,100 fps can't stop decisively. All of the top builders will give you a quality product, but if you want it done correctly and fast, I would contact Jack Huntington at (775) 355-6898. Call him and talk to him. You won't be disappointed and he won't break the bank in the process. Here is something similar to what you seek, but in .500 JRH.